[Perfectlap]

Wow 2+ hours on a wash sounds meticulous. Please post pics some time. Especially that 993 toorbo.

I'm the total opposite. I can't stand spending a long time doing something I'll have to do again. That's why I swear by the 7 minute No Rinse wash and the 425 spray (aka paint teflon).
Not having a black interior also helps massively. ditto for silver exterior. I will never buy a car with black outside or inside. been there , hated that.
I also stick with lonnng lasting, dirt-repelling synthetic waxes rather than than shorter-lived bios that seem to suck in everything. I don't bother with four and five step product families -- I keep it simple, two coats of bullet-proof wax (1000P high temp) every quarter and a post wash wipe down with detailing spray (Werkstat Jett). My theory is that if you do something frequently (but quickly) you stay ahead of the buildup. and I'm convinced that those auto microfiber towels are paint culprits. They're great when they're right of the bag but they grab onto everything and are stubborn in letting that go in the wash. Waffle weave towels are now made in smaller sizes, a little pricier, but they easier to keep clean and paint safe. It's not like your cleaning the high traffic kitchen floor, you're cleaning a well-maintained import.