OK posted about this before but now got timed proof of the process.
Sunday night about 6:00 pm found a bucket in a corner of an old shed that has a leaking roof, more a lean to and nothing of value in there or shouldn't be.
However this bucket contains all my bricking tools which fortunately haven't needed to be used lately.
This was a brace and bit type drill as it came out.
Probably been in there for about 3 years.
Didn't toch it all all, just dropped it into a bucket of brick and patio cleaner diluted 2:1
Don't think the ratio matters that much but I did 2:1 to fill the bucket.
So went in at 6:00 on Sunday and came out 12:00 non yesterday, Monday so 18 hours just sat in a bucket.
This was it when it came out with no extra cleaning.
De-rusted enought that the chuck unscrewed by hand and the ratcket knob needed a slight help with a pair of grips but it all works.
Little trowel is useable but scarred.
So quick process, relatively inexpensive, no electric needed just a plastic bucket of some sort and the waste can safely be washed down a drain as that what it was made for in the firts place.