Some call it white rust. I believe it's called zinc oxidation. I have a YF that is/was in horrible shape that I (a novice) am trying to salvage for the experience. Before and after pictures. Cleaning still in progress. I used Evapo-Rust for the first time. It's slow acting. Mainly for steel and cast iron. It DOES react with the pot metal in the bowl and air horn but it's slow enough to keep an eye on. If you have to be patient and let this stuff work. I would not use it on light corrosion. I knock it off with a Scotch Brite pad.
Lacquer thinner is great for cleaning up oil and grease. It is quick drying.
Last edited by buoymaker; 06/01/20214:00 PM.
"Adding CFM to a truck will only help at engine speeds you don't want to use." "I found there was nothing to gain beyond 400 CFM."
