bb2170,
Please, keep in mind that the screws are exactly what the name implies, "stain LESS" not stain proof. I know that you are not complaining, you are just looking for a way to keep you BB cool looking and I am with you.
Best way is too wash your boat EVERY TIME you use it with fresh water and even if you don't use it often it is a good idea to hose it down weekly, then in areas where water can stand, as in and around the screw heads, blow it out with an air hose then lightly spray with WD40 or Corrosion X.
Should take care of your problem.
See Ya,
Blazer Johnnie
