When it comes to the RUST that form on the rotors after a wash (the same rust that then gets all over your clean wheels upon the first brake-action)...give this stuff a try. This product will keep the rust from forming on the rotors after your wash.
I know this isn't the question that was presented by the OP...but since you're talking brakes, washing, rust, etc...this product does help with that dreaded rust-cloud from the first braking after a wash.
https://www.obsessedgarage.com/produ...bSKdNahLy7COyy