I mini detail my car every time I wash it. Even open doors, boot , bonnet and petrol cap and clean the sills, inside etc. Takes an extra 5 min work but keeps car spotless.
BTW, I pulled out spare wheel and Jack ( replaced with tyre in a can) Fish oiled the boot and cleaned the inside of the rear quarter panels.
I found heaps of lego pieces in there ( always wondering why there was a rattling sound back there:rolleyes: )