They do not have any special coatings. There are a number of graffiti removal chemicals available

They are not specially coated

I tested Goof Off Graffiti Remover on the receptacle. It works pretty good. Doesn’t seem to damage the manufacturer’s coating. Only problem I’m having is the goof off rapidly drying in the afternoon heat. I’ll try it again when the temperature is cooler.

The Graffiti Remover worked OK on the outside but it’s very well bonded to the plastic inner liner. The inner liner needs a little satin black paint.

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