Water shouldn't hurt, I regulary use engine cleaner, and hose off engine,
I drive through puddles, in the rain, go to car washes. Sounds like some "
funny business ". Start by testing grounds,
try running a jumper cable from starter housing to
negative battery terminal, to verify starter is fully grounding.. Sometimes
a skimpy ground lets some current through, but not enough to crank.
A good test is, turn on headlights, watch lights as you try cranking. If
lights don't dim = open circut in starter. If lights go out = bad ground.
If lights dim weak battery. I'd think this is more of a co-incidence, and it would be
almost belittleing to
think a few drops of coolant would take out a starter. Than again, we're
talking modern cars !