It loses all hydrophobic behavior once it gets dirty, especially with mineral deposits. Somewhat overrated product. I can bring it back with CarPro Descale but it doesn’t stay functioning as well as I’d like between washes.
I recommend something I haven’t used because in the two tests I’ve seen it was strong. The same resin is in the waterless, which I have tried. It’s just diluted and has surfactants. The waterless sheets water faster than Griot’s 3-in-1. It’s pretty impressive stuff.