I think the trick here is to make sure you look after the paint when cleaning , ie don't use a sponge and pat dry with a microfibres cloth along amongst othing things. If the paintwork is cleaned properly and not damaged the the exterior is the icing on the cake so to speak.
I don't let anyone clean the car other than myself as well.
I see so many people washing their cars the wrong way that no wax is going to correct.
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