Re post by SPB-Cooperator on 10.1.13
At Napier University in Edinburgh (don't know if they still do it) if anyone parked where they shouldn't they did get a very big and VERY adhesive sticker stuck on their car, saying they were in the wrong place (happened to my son!) Warm water at any price would NOT take these stickers off! it took hours of scraping, risking scratching the windscreen, or industrial solvents to get the stuff off. VERY effective at stopping people parking in the same place again!