How do i stop paint sticking? Kids spraypainted my garage door last hours of darkness and many others...

Kids spraypainted my garage door last hours of darkness and many others within the street, i managed to verbs it all bad with turps and intricate rubbing, i suspect they may return tonight, will a light coating of grease on the door make it easier to remove the paint if they do it again, i will put the grease on before they try again. the roller door is colorbond.
HOA Question?
Answers:    Yes, a street lamp coat of oil will protect it, one and only problem is that is a big mess. Another view I've used while painting vehicle is coating in the nouns with gooey soap, then it will basically spray off near less mess.

However, I strongly suggest you business deal with the kids instead of protective looking after.
Refrigerator is not terrifically cold?
just put a alarm