What amp breaker should I use for a out side 110 outlet using 12 gage wire.Used for plugging in vacuum cleaner to clean cars.

15 Amp should be fine, 20 Amp is minimum can be used down here, and is what I would Use, on a 20 GFI breaker, Or a 20 Amp GFI Receptacle. 20 Amp circuit requires #12 wire.