Blue Bonnet

‘ve got a problem. Just today my neighbour decided to plaster his window and a dollop of plaster fell on the bonnet of my car and dried up

By the time I was back, it had dried up. I immediately got a bucket of water and soaked and got it off

However there is a "halo" where the plaster was. The inner region is exactly like the original paintwork whereas the outer bits are whitish.

Please help!! Im quite annoyed and upset with this! What can be done to remove these marks?

try a little rubbing compound to the spot . then polish then charge the doer of the crime in small claims court