theres a product by the name PEEK can usaully get at hradware
stores in the kitchen cleaning supplies , will look like knew
comes in a small squeeze tube.
I usually spray it with carb cleaner then hit it lightly with a scotch brite pad. Once the rust spots aren't as visible I polish it with a Powerball and it looks like new.
I asked the SLP guy that exact question at the snow show this year. He said, HOT water (as hot as you can stand) and soap. Then use mothers or any other metal polish. Its best if you use a polish that has silicone in it.