Try coating them with some of this:
http://www.amazon.com/Flood-Penetro...d=1412826008&sr=1-1-catcorr&keywords=penetrol
Clean them really good first, this stuff will last for a year, if not more.
http://www.amazon.com/Flood-Penetro...d=1412826008&sr=1-1-catcorr&keywords=penetrol
Clean them really good first, this stuff will last for a year, if not more.