I use break-free CLP.
Gentle on blue, seems to get all the crud out of tight spaces and is not effected by cold weather like some wax/oil based cleaners.
From their website:
* Penetrates and spreads along metal surfaces into every pit and crevice to undercut contamination and lift residue away where it can be removed.
* Long-lasting lubricating film dramatically reduces adhesion of sand, grit or other abrasives which cause wear and failure.
* Corrosion inhibitors prevent the formation of rust while Break-Free's unique boundary film protects metal surfaces from moisture and other contaminants.
* Specially formulated synthetic oils won't lose viscosity, dry out or stiffen up in extreme environments - such as cold, heat, dust, dirt, humidity and even salt air - keeping equipment in ready condition for months at a time.