Well it's more like he has been using his face as a paint brush - we have been doing some painting at home, and managed to keep Trapper and Bosco away, but somehow Trapper managed to escape and rub his face on our bright red door, so he now looks like he has been gorging himself on a dead animal

It's gloss paint,so won't wash off. We would normally use something like white spirits to clean the paint off our own skin, but I'm not sure if that would be a good idea for a dog, especially as the paint is on the side of his muzzle between his nose and his mouth.
Do you think I should just let it wear away naturally, or is there something else I can do -safely- to remove the paint?