Do you detail a customer's Porsche the same as your own beater?

I work mostly on family haulers and work trucks, but last summer I did a buddy's GT350 and I'll admit I did a couple things diferent. The wash routine was the same as always, foam first, then a proper contact wash with my mitt. What changed was the supplies, not the technique. Brand new mitt, fresh microfibers straight out of the pack, and I doubled up on my rinse buckets because I did not want to gamble on my older gear at all. So in my head I sort of split it into process, which stays the same, and consumables, which I upgraded that day.

The other thing I noticed was pacing. I normally bang out a wash and wax in half a day. On that Mustang I took the whole afternoon and barely touched the polish step because I did not want to be correcting paint I had no business correcting. Sometimes doing less is the right call on a car like that. The nerves thing is real though. My hands were shaky for the first ten minutes and then it just clicked that it's a car, it has clear coat, and the same rules apply. The owner noticing every swirl is probaly the biggest difference, so I'd say do your normal safe method but with your best condition towels and a bit more patience.

I do the exact same wash on everything, and I learned that the hard way. A few years back a coworker asked me to clean up his wife's RX-8 before they sold it, and I got so paranoid I started improvising half way through. Skipped my normal pre rinse because I 'didn't want to blast it,' used a spare towel I wouldn't normally grab, and ended up putting more swirls in that hood than the last five daily drivers combined. My routine exists because I trust it, and second guessing it mid job is what actually causes damage. The one thing I do change on nicer cars has nothing to do with washing. I take pictures of every panel before I start and text them to the owner with a quick note about what pre existing swirls and rock chips are allready there. That single habit has saved me more stress than any technique ever did. If the owner texts you six times asking how it's going, those photos are your answer. One honest question back at you though. Was that 911 ceramic coated or sealed from the factory era paint? On my buddy's Macan the dealer coating behaved noticeably different under my clay lube than bare clear, slicker but almost grabby in spots. The paint may not care about the badge, but whatever the last shop put on it might.

That RX-8 story hits home, the worst thing you can do is abandon your routine halfway through. I agree with keeping the process identical and just slowing down. Only thing I've ever changed on a higher end car is the drying step, I switched from my regular waffle towel to touching the paint with nothing but filtered water and warm air from my blower, then patting with a fresh drying towel I saved just for that job. Same method, better gear. Funny enough the owner never asked about swirls, he spent ten minutes asking how I got the exhaust tips so clean.

I've never touched anything fancier than my neighbor's Audi but something I noticed just reading this, half my swirls probably come from working in my driveway where the lighting is garbage. I'm guessing in a nice shop or garage you can actually see what you're doing before you touch it, which might matter more than nerves. Do you find the better lighting alone makes you more careful, or does it just show you every flaw and make it worse mentally?

Gotta push back on the 'do less on a nice car' take from the GT350 reply. If your correction process is safe on a daily driver, it's safe on a Mustang, full stop. Skipping polish because you're scared isn't a technique, it's just nerves dressed up as a decision. I machine polish whatever the car needs, and the only thing that changes is I do a test spot first and check my work under real light before going further. If anything that's a habit people should use on every car, not just the fancy ones. Half the dailies rolling in here need correction way worse than any exotic does.