I have been to every car wash in Pattaya since 2008. The best hand car wash staff and customer facilities, by far, are at PP Car Care Thepprasit Soi 6 (Khopai) opposite Alley 14.
I have been going there over a year and I'm here now. The standards are the same every visit. 350 THB for my twin cab for everything. Wash vacuum, interior and exterior shine, they even clean & shine your wheel Arches
I just booked in for a full AutoGlym polish/wax next week. That's 1,750 THB for my big truck on Promotion in June.
It's got everything - Air Con Café , hot food, massive drink selection, big screen, 5G, device charging, huge terrace, fans, hammocks and sells alcohol (for your passengers!!) most important amazing detail in their work, and an Ex-Pat owner who's spent a lot on the facilities.
I'd recommend it to anyone without bothering to look at others.