In reply to higherclimbingwales:
> Don't use WD40 or other oil-based products as these tend to attract more dirt.
I think this is a long running debate, but:
Down here in Cornwall, we (I) use WD40 to drive out particulate matter (sand). Personally, I then wrap bog roll into the spaces between cams, to soak up excess oil. Whilst it might attract some dirt, here on the coast it definitely repels salty air.
Stiff cams are generally stiff through gumming-up of non-loaded parts. Not usually a reason to bin the gear.
Martin