I was cleaning my rear axle housing with brakekleen sprayed on a rag. I was using my index finger to clean the area around the mounting bolts and the surface, there was still some metal shavings attached to the parameter of the mounting surface. I was pressing hard on one spot and a piece of the shaving went through the rag and into my finger. Piece was about 1" long and 1/32" wide. Hurt like he!! pulling it out.