I spray the outside of the dist cap/distributor with carb cleaner.

I pack a plastic bag into the distributor cap to keep out water,
wrap another bag around the outside to keep out water,
pack the carb with plastic bags and cover it with a plastic
tupperware lid, gunk the motor down and spray wash it
at the car wash where they have the filters to reclaim
the water for other car washes.

I use my air tank to blow water off the engine-end of the
plug wires where the plug boot is, remove all the plactic
bags, etc.and it starts/runs good.-Bob

Mean green removes any dried rusty water ..............