We use them at the plant for moving large valves on stainless steel ball tables. The ball tables get covered in black crap coming off these plates and it is causing a contamination problem.
I wore out a new 4 1/2" Dewalt flap disc on one plate today (60 grit) and had to finish with something else. That disc cost 8 bucks. There will be 30+ of these plates and both sides need to be clean.
Maybe a grinding disc followed by sanding? Rust shouldn't be a problem, the plates stay covered in hydraulic fluid 24 /7. This first one is a trial to make sure they don't rust.
I want to stay away from chemicals. What do you suggest? or any ideas to prevent this contamination would also help. These ball tables are very hard to clean.