Sand blasting John? I had not considered that because of the left over sand getting into the engine, but I guess it is the same as dirt. I could sand blast them clean and then put them in the dishwasher when she is gone. She has never forgotten when I put the daughter’s valve covers in the dishwasher out of her Lexus.
When I pulled the mesh out of those years ago, the amount of fine dust and that came out really surprised me. the dirt was so fine, and filthy kinda weird dirt. I finally got the mesh back in, but I could not get the mesh to tighten up to the outside. I used some piano wire to hold the mesh back by twisting the wire in through the big hole, but again they looked wrong.
Madflyer I have some of that ZAP stuff somewhere and I remember it was strong. The stuff I had seemed very chemical, so it might be different. The ZAP I had was in a spray bottle.
Gasoline seems to take the paint off which is fine and it cheap, but it leaves a rusted finish, but I guess everything would once the paint is off.