Cleans and is quite hydrophobic at first, but I'm back with rainx. This material only remains hydrophobic for about a week. Rainx gives me about 2 months between uses. In addition, OptiGlass Pro users are advertised as saying that OptiGlass Pro will last forever. Oh no. This is BS. I had an Optiglass Pro windshield coating and it was great, then I used this product for "support" and then after about a week I have to use the windshield wipers on the Autobahn too because nothing runs or flowsβ¦