I'm trying to get my factory step rails off my Z71, but its not working....they are well rusted. Anyone know of a lube I can spray on them everyday for a few days to loosen them and get rid of some of the rust??? I really dont want to bust a bolt, especially a body mount bolt.

 

I use Kroil, but it's a little on the pricey side.

 

^^what he said. kroil works best for me.