We have a paint-stripping business and use potash flake and caustic soda all the time, should do the trick but it can do nasty business with aluminium - it doesn't look pretty anymore after it's been in contact with caustic. We did some galvanised trailer parts a while back - took the galvanic layer clean off.
We have a paint-stripping business and use potash flake and caustic soda all the time, should do the trick but it can do nasty business with aluminium - it doesn't look pretty anymore after it's been in contact with caustic. We did some galvanised trailer parts a while back - took the galvanic layer clean off.