[Yetti]

I have had it happen to me, its from the wiper wells draining down the inside of the fenders to the ground. I suggest using the garden hose to gently wash away the ice by letting it run up on the cowl and wipers. once its cleaned out it should stay out unless you don't clean out the wiper wells when full of snow.

by the way if you just use tap water or well water its coming out of the ground at 55* so don't think you need to hook to hot water.