Chainsaw Repair

I use a flap wheel everyday and have never even marked the chrome but like I say , I take a new wheel and grind steel with it for a minute or 2  but I'm also thinking that maybe we are not taking the same thing here on the flap wheel, Where I buy them that is what they call them , I also use easy off with a bit of heat before hand on the jug, works very well and fast , On most jugs I clean up I'm 5 minutes and I'm done