well it started the day I bought it with 12,000 miles.
Clean it weekly at least and you end up wit that.
Seriously. You have to get on top of it and stay on top of it. I spray simple green over the whole engine and let it sit for about five minuts. The rinse. The dry with a towel. Wax the jambs and metal parts. Hit all the hoses, rubber and plastic with Meguars Shine, and spray the chrome with glass cleaner.