A friend told me recently not to ever write 'wash me' or anything 'humourous' like that onto a dusty car, as it will scratch the paint work easily. Stated that dust on cars is tiny rocks and abrasive, and so WILL scratch your paintwork. This started up a lil debate, another mate stepped in and said 'Wah?' if the car is fairly new, the lacquer would protect the paint no problem- and so a lil debate was had with no clear winner. This issue also came up in family the other day lol, anyone got any thoughts on this pointless debate?