They fixed a slow leak in a bmw tire I brought in. Balanced, etc. I asked them to confirm that the tire wasn't damaged by being driven (not by me) with low pressure in the tire. No damage reported. There was some CV joint grease on the backside of the wheel, some of which they cleaned off to attach the new balance weights. The rest which I cleaned off when I got home. I'm guessing the remaining grease I cleaned off isn't enough to throw the new balance off.