[njsteve]

I used that safestrustremover stuff on an NOS flywheel (let it soak in the liquid) and it was amazing - brought back the original machined surface. I think evaporust is the same buffered solution liquid. Don't use the phosphoric acid based liquids on something like this because they convert the rust to a hard material, versus the buffered solutions which actually wash away the rust and stop when they reach virgin metal.