re wd as moisture repellant was lead acid batteries c in sasrer cinnamon sasrer unx sas com writes services we offered was an engine cleaning remove all that oil before you sell the car unfortunately we did not have a high pressure washer so we would use one several miles from the shop on more than one occasion after washing the engine it would not start as water would have gotten under the distributor i would put a plastic bag around it to try and minimize this around the spark plug wires etc and it would be nearly impossible to try and wipe all these areas down with a dry rag the usual solution was to carry a can of wd and when the car wouldn t start to spray all the likely areas and it would then start on the very first time this definately gets the car going but wd is highly flammable explosive even in the right conditions like a vapour sealed inside a distributor for eg and contact points tend to arc a tiny bit i once saw the alternator points cover blow completely off a motorcycle after it had been restored to life with wd fun to watch it was a honda mr minibike and the cover is only held on by large rubber grommet so it wasn t really a big blast graham b ps as a more serious aside it is apparently also conductive so it is best to exercise caution with it around mains wiring
