Re: ASP pulley getting some rust...
You can clean (bolts) them up and then spray some satin polyurethane to cover it. It does not look like they have been painted and the rust is prevented from then on.
If you have real rust to clean up a little muratic acid a.k.a. concrete cleaner will remove the rust but you need to clean it and wash it afterward to prevent further rusting. Just read the cautions...........
Enjoy Woody