Does anybody know the secret to keeping moisture out of a distributor cap while pressure washing a truck. It always seems to be an issue. If there is no way to keep the moisture out then what's the best and quickest way to dry it out after?

And what about pressure washing electric trucks. When we do it, no matter how careful we are, moisture gets into the electrical components and causes a "PMT" situation and/or the dust in the motors turns to mud when mixed with the water.

I've heard about the "dry ice" cleaning machines that work unbelievably well but I think that they are extremely expensive.
Any thoughts or cures on either issue would be appreciated.