How can I remove this mould from painted surface?

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How can I remove this mould from painted surface?

This topic has 26 replies, 16 voices, and was last updated 6 April 2020 at 23:24 by Neil Wyatt.

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2 April 2020 at 01:05 #461656
choochoo_baloo
Participant
@choochoo_baloo
I left my astrophotography gear under cover outside for the winter nonths – a mistake I know.

When uncovering I found mould had grown on the powder coated (?) telescope tube. See photos below.

Any recommendations on how to clean it?

From Internet searches it seems bleach with a toothbrush is a good way to go, but thought I should get some extra advice before driving in! Thanks in advance.
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2 April 2020 at 01:05 #10147
choochoo_baloo
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@choochoo_baloo
2 April 2020 at 05:36 #461665
Hopper
Participant
@hopper
Here in the tropics where we get 8 feet of rain a year snd things tend to go a bit mouldy we generally use a mix of household detergent and bleach. Bloke i pay to do the outside of my house swears by it too .
2 April 2020 at 07:03 #461673
pgk pgk
Participant
@pgkpgk17461
Dilute vinegar would probably work too..many moulds are sensitive to pH

pgk
2 April 2020 at 08:56 #461694
Mike Poole
Participant
@mikepoole82104
HG mould spray is very effective but vile if you breath it in, probably just a bleach though.

Mike
2 April 2020 at 09:33 #461707
Dave Halford
Participant
@davehalford22513
Bleach does not kill mould, it just bleaches it. Anything sold as a mould killer won't be just bleach.
2 April 2020 at 09:57 #461713
pgk pgk
Participant
@pgkpgk17461
A quick punt about on Google suggests that bleach does kill mould but only on the surface whereas vinegar is more likely to penetrate a porous surface? Reality is that neither is likely to deal with mould spores so in an indoors situation where mould and it's spores are a human hazard one would need a much more active, specilised approach but on a single item like this probably either would work.

I have a problem with botrytis on my citrus when i put them into winter quarters every year due to lack of ventilation and higher humidity. If I proactively spray them with something that prevents the spores growing then everything is OK. If I leave it until the spores are geminating then it gets out of hand rapidly. Copper is another useful toxin as bordeaux mixture but leaves the blue colour.

ogk
2 April 2020 at 10:04 #461718
Neil Wyatt
Moderator
@neilwyatt
Is that a WO scope?

Tut! Tut! Slapped wrists!

Neil
2 April 2020 at 10:05 #461719
Bizibilder
Participant
@bizibilder
That looks like a decent scope so don't attack it with bleach! Best to try simple warm soapy water and a soft cloth first – you can give it a good rub but don't damage the paint. If that doesn't clear it try isopropanol – you can get that via the internet. Keep well away from Meths/white spirit etc as they will almost certainly damage the paintwork.
2 April 2020 at 10:19 #461727
Samsaranda
Participant
@samsaranda
PGK, I think Bordeaux Mixture is now banned in all European countries, I think eventually we will only be able to use plain water, it’s health and safety gone mad, I blame the EU they have been responsible for “sanitising” all our treatments. A pet issue of mine is the treatments that are now allowed on timber, if you buy fence posts now you are lucky if they last more than two years once in the ground, they just rot away; I have a fence that I put up 25 years ago and it is still solid, no rot at all. Sorry to side track the posting.
Dave W
2 April 2020 at 10:25 #461730
Circlip
Participant
@circlip
" When uncovering I found mould had grown on the powder coated (?) telescope tube "

Polyester powder? If so, it shouldn't be used for external usage. Solution, use Epoxy powder or don't leave outside.

Regards Ian.

Perhaps contact with scope manufacturer would help?

Edited By Circlip on 02/04/2020 10:26:44
2 April 2020 at 10:45 #461739
pgk pgk
Participant
@pgkpgk17461
Posted by Samsaranda on 02/04/2020 10:19:25:

PGK, I think Bordeaux Mixture is now banned in all European countries, I think eventually we will only be able to use plain water, it’s health and safety gone mad, I blame the EU they have been responsible for “sanitising” all our treatments. A pet issue of mine is the treatments that are now allowed on timber, if you buy fence posts now you are lucky if they last more than two years once in the ground, they just rot away; I have a fence that I put up 25 years ago and it is still solid, no rot at all. Sorry to side track the posting.
Dave W

I make my own bordeaux for that reason. It's a few citrus trees rather than a commercial plantation. I'll also admit to using sulphur to 'sterilise' my greenhouse at the end of season. Sulphur candles are also banned but you can still buy sulphur granules to acidify soil and it burns just fine in the greenhouse but needs precautions.

The fence post issue affects me too. Ideally one would buy sweet chestnut posts.. why I've got several trees from seed growing for future owners of this farm.

pgk
2 April 2020 at 11:07 #461749
Dave Halford
Participant
@davehalford22513
When you read Google carefully it mostly says hard surfaces, as in glass, metal and glazed surfaces of tiles which will clean with a cloth anyway.

Most coatings have a porous bit which is why moulds get into gloss paint and silicone sealer.

Linky this is as good as any link

In the OP's case there's apparently no mould on the hard anodised surfaces, just the powder coat, so it may have grown into the coating. There nothing to stop trying bleach, it may reduce the black but it will grow back given half a chance.
2 April 2020 at 14:45 #461807
Martin Hamilton 1
Participant
@martinhamilton1
I tried all the usual mold removal products including HG mold removal & none were that good, this was for the black mold you get on the beads of silicon around the bath + around the silicon bead on PVC frames. Since found out the best way is with thick clear bleach removes all the mold, i dont use anything else now after finding out this was the best solution. You must leave the thick bleach on for at least 24 hours, it is best to put bleach on the area then lay toilet tissue over the bleached area & then add some more bleach onto the tissue & leave to soak for minimum 24 hours. Then simply wipe of with all the mold gone, i find this method keeps black mold away for a couple of years before any returns, dead simple to do & cheap as well. It must be clear thick bleach & not thin.
2 April 2020 at 14:57 #461812
Martin Hamilton 1
Participant
@martinhamilton1
By the way the thick bleach method is only for non porous surfaces.
2 April 2020 at 15:02 #461815
John Paton 1
Participant
@johnpaton1
Posted by Samsaranda on 02/04/2020 10:19:25:

PGK, I think Bordeaux Mixture is now banned in all European countries, I think eventually we will only be able to use plain water, it’s health and safety gone mad, I blame the EU they have been responsible for “sanitising” all our treatments. A pet issue of mine is the treatments that are now allowed on timber, if you buy fence posts now you are lucky if they last more than two years once in the ground, they just rot away; I have a fence that I put up 25 years ago and it is still solid, no rot at all. Sorry to side track the posting.
Dave W

The National Building Specification for wood preservative calls for it to be biodegradable. I consider that to be an Oxymoron so when you go to buy some wood preservative ask the supplier for a litre of Oxymoron and see what you get!
2 April 2020 at 15:14 #461821
Martin Hamilton 1
Participant
@martinhamilton1
By the way the thick bleach method is only for non porous surfaces.
2 April 2020 at 15:24 #461822
Martin W
Participant
@martinw
Hi

The best product I have used for the removal of black mould and the staining it produces is 'Kilrock BLAST AWAY Mould Remover'. While I don't know what the effect might be of applying it on the painted surface of your telescope I have used on a variety of surfaces including emulsion paints, oil based paints, various plastic surfaces, silicon sealant, acrylic sealants, bare plaster and have not noticed any detrimental effects to any of these surfaces. That said one of its constituents is clearly a bleaching agent similar to normal household bleach probably sodium hypochlorite. Not only does it remove all traces of the mould, including any staining, it also seems to actively inhibit regrowth especially on the more porous surfaces.

It might be worth testing some on a small inconspicuous area to see how quickly it removes the staining/spores and check if it has any detrimental effect on the coating. You can purchase as a liquid spray or brush on gel from various high street outlets or from ebay.

Usual disclaimers other than I have found it to be extremely effective and usually have some about just in case I find some mould about the place.

Hope this helps

Martin
2 April 2020 at 15:35 #461829
SillyOldDuffer
Moderator
@sillyoldduffer
Send that repulsively scrofulous telescope to me. It's a write-off, unworthy of any decent observatory. Being an oik I might just about be able to ignore the hideously distressed paintwork whilst stargazing in the dark…

Dave
2 April 2020 at 16:39 #461857
Neil Wyatt
Moderator
@neilwyatt
Cillit Bang mould remover!

Just ask Barry!
2 April 2020 at 23:43 #461971
Steviegtr
Participant
@steviegtr
Bi-carbonate of soda. Cleans mould from fridges & bathroom tiles.

Steve.
3 April 2020 at 11:17 #462038
mechman48
Participant
@mechman48
…he best product I have used for the removal of black mould and the staining it produces is 'Kilrock BLAST AWAY Mould Remover'. While I don't know what the effect might be of applying it on the painted surface of your telescope I have used on a variety of surfaces including emulsion paints, oil based paints, various plastic surfaces, silicon sealant, acrylic sealants, bare plaster and have not noticed any detrimental effects to any of these surfaces. That said one of its constituents is clearly a bleaching agent similar to normal household bleach probably sodium hypochlorite. Not only does it remove all traces of the mould, including any staining, it also seems to actively inhibit regrowth especially on the more porous surfaces.

+1… best stuff I've used for bathroom & kitchen mould along with all the above.

George.
5 April 2020 at 12:51 #462469
choochoo_baloo
Participant
@choochoo_baloo
Posted by Neil Wyatt on 02/04/2020 10:04:34:

Is that a WO scope?

Tut! Tut! Slapped wrists!

Neil

Umm yes afraid so. The GTF 81 (5 element to be precise). Takes great widefield shots!

—————-

Thanks for the help all. Scrubbed on branded mould cleaner with a tooth brush, took it off within about 5 secs. Then I liberally wiped with a damp cloth afterwards to remove the residue bleach.

—> now good as new!
5 April 2020 at 15:19 #462505
Neil Wyatt
Moderator
@neilwyatt
Glad to hear it's OK. Any photos to share?

Neil
5 April 2020 at 16:03 #462512
Robert Atkinson 2
Participant
@robertatkinson2
An effective, safe fungicide is benzalkonium chloride. This is used for everything from eye drops to patio cleaner. Dettol dishwasher cleaner is a good low volume source. It works well on sensitive surfaces. Bleach (Sodium Hypochlorate solution) most certainly DOES kill fungal growth and inactivates spores. It also bleaches any colour deposits. The disadvantage is that it causes corrosion.
Killling and removing the fungus may not restore the surface finish. Chemicals secreted by the fungus can etch or corrode the surface causing damage that has to be repaired by re-finishing or polishing. Fungus won't grow on aluminium but it will grow on contamination on surface, even finger prints. Th secretions can still etch the aluminum giving the impression that the fungus "eat" it.

Robert G8RPI.
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