Warm water wont hurt it if your not soaking it in the bath tub, just rub over it with a rag to dry it off good when your done cleaning. You could even use 4-OOOO steel wool with some kinda of oil or Go-Jo hand cleaner W/OUT the grit. Be careful around the decal so you don't rub it off, I have seen some under the finish and some laying on top. The finish looks beat up a bit and you wont be able to do much with that except scuff over it and recoat it or just refinish it completley. I say a good cleaning should do just fine though.