As above I have one but don’t use it every time I wash the car. It definitely gets used at waxing time or piping lubrication sessions though. The bottom line is that the nooks and crannies are the worst places for corrosion to start, as they stay wet longer nd hence ripe for it.
Would I buy one? No, just got lucky in a competition! I do have a compressor so I used that until the win.
