I applied the Gyeon QuickView product to my 2019 Model 3 a few days ago. Easy process in my garage. Basically just apply it to your CLEAN windshield with the built-in applicator, wait 5-10 minutes, then wipe the windshield with a clean microfiber that is wet with hot water from a tap. Haven't had any downpours yet, but the product has worked well so far in light mist and rain. This is pretty useful here in Oregon where the Tesla "auto" settings for wipers don't really seem to work well. I'd recommend this product to anyone that lives where rain is frequent. Attached photo is of me doing the wiping process after application.