I recently got the Medium & UF Spyderco stones and had to do some minor flattening of the UF stone, something I don't look forward to doing again. The medium one was flat. I had some old Buck Brothers and Stanley chisels I wanted to try on the stones to see how they worked. Per the instructions that came with the stones, I used a powdered abrasive cleaner (in water) and a non-metallic scouring pad to clean them to remove steel particles. However, after doing this, I still see slivers of steel embedded in both stones. I don't thinks this is normal, or is it? If it isn't, how do I go about removing them. I think that they may be leaving scratch marks on the backs & bevels of the chisels. I like the stones, but if removing the slivers of steel is going to wear out my Atomas and/or DMTs, I'll just toss them out.