I've had my wax on for 5 weeks, it's not as smooth now but still good. It's always parked outside, with a cover on almost all the time. Haven't washed since. And my car is black. It's holding up but maybe I'm just not meticulous like you I've given up on being too particular about it. I take the cover off for 15 minutes and a layer of dust is already visible.
Last time I left it in a car port, a painting tipped over and was propped against my passenger side door. I blew a blood vessel.
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