If you spray WD40 on the cement and let it soak in for a day or two maybe that would work

HI, while hydroflouric acid has many uses it is pretty nasty stuff to handle. First of all don't put it into a glass container, secoundly don't breath the vapours and thridly it will burn through your skin before you can feel it. See **LINK**

Regards Nick.

Hi Falco,
First is it cement or plaster as this is important for chemical removal methods ? My suggestion is only suitable if you can remove the part. Soak the item in water then put it in the freezer. Repeat this process as required. The water freezing should crack the deposit. Also the different coefficients of expansion should help. (It does not matter if it is cement or plaster for this method.)

Les.

There is a substance I have not seen before called Belle Clean Concrete dissolver. It reads as if it could work well, but not actually tried it. Tool-net.co.uk list it.

Pete

Try toilet de-scaler. This contains weak hydrochloric acid.

Hi Falco

A high pressure water washer will do it, I have used one to remove cement that has set on bricks, If it is plaster it will only last milliseconds. I did an entire building, it took several days and worked very well, and no acid……….

If you use one on brickwork you may mark damage the bricks if they are soft you will need to reduce the pressure. Metals are not marked all.

You will have to tie your part down on some sort of support first or it may take off if it is light.

I suspect your piece is will be anodised, if so many chemicals will discolour it (including the cement) plain water is unlikely to mark it.

Regards
John

Edited By John McNamara on 22/09/2013 15:12:17

Freezer spray….ali has high coeff and you would be unlucky for cement to be the same…

Wow, what a lot of replies to a domestic problem with what is supposed to be a 'reliable domestic supplier installation'. I have to say that, any person who crosses your threshold to carry out work on your home can not be trusted to do a good job! That is why i do most of my own domestic challenges. But age now is against me and i wish you all good luck in selecting a reliable domestic installation — engineer- gas fitter- painter- plumber- decorator- joiner etc!

Based on:

My mother in law (76 years old and energetic) has just had a conservatory fitted. What a fiasco, we were very care full to make sure that all bases were covered and that the builder chosen was in charge and knew what we wanted, he was in charge of the glass and plastic's supplier and was supposed to know what what was required. Ha, the builder got it all wrong and the glass man made a complete bu""er of it!!!!!!!!!!!.

We too now have plaster on the aluminium, however it soaked off with water and it came off the aluminium with no problem, so i am lucky.

Why does no one give a service to be proud of any more!!!!!!!!!!!!!!

Not engineering, but in the general run of the thread created.

Bri

Not quite alien ship eating blood..but you get the idea..seem to remember amputation as one of the “treatments”..seems harsh but dire consequences of entry into blood stream..

Hi Jason/Gents

I feel sometimes users of forums should be wary of frivalous references to some chemicals where accompanying MSDS for the chemical proposed and of appropriate PPE would give clue as to its hazards if used I'm also mindful of the claim that it's not usually what you use that's the hazard neglect, but the bit left around for the unwary to play with in your absence that brings a rude awakening

Rufus