Oil paint on Angulate

Over the December tourist season some idiot thought it would be a good idea to paint this tortoise. I see him regularly and he seems unaffected by the paint, but he is very visible with no natural camouflage anymore. I rinsed him underwater a few months ago but the paint is oil-based and I don't want to use solvents. Any ideas about removing it? Or should I just leave him be?


View attachment 133467
View attachment 133468