After the purchase of any new car, an opportunity to rust proof arises. Should you do it, or is it just a waste of money?

I recently purchased a certified used 2015 Toyota Corolla. The dealer recommended that I purchase rustproofing. He said extra rust protection is no longer done by manufacturers, since cars are sold in ...

I recently purchased a certified used 2015 Toyota Corolla. The dealer recommended that I purchase rustproofing. He said extra rust protection is no longer done by manufacturers, since cars are sold in ...