I recently used Opti Clean on my windshield and rear window (I normally only use it on painted surfaces) and I was very pleased with the results. The glass was very clean with no smearing.
A few days later it rained and the water was beading and running nicely off the glass. I didn't even have to use my wipers.
All was good until the rain stopped and the glass dried with a film of spots all over it.
Has anyone else had this happen?
Did I apply too much product?