Along with grumpy, I'm not a fan of WD-40. It's OK for surface dewatering, but a poor penetrant, and an even worse lubricant.

I'd suggest any of CRC 5-56, Inox, or grumpy's favourite, Penetrene, as far superior products for this job. Or Castrol DWF, if you can find it.

If you want a DIY mix, 1:1 [by volume] of Acetone and Dexron II or III spec Automatic Transmission Fluid is very good indeed. Don't try to keep it in a plastic container, though.

Cheers,
Gadge

"ODK Mods can explain it to you, but they can't understand it for you..."

"Crazy can be medicated, ignorance can be educated - but there is no cure for stupid..."