Yup. A little lapping fluid or light oil, on the bevel, not the wheel, helps, but isn't necessary. Just take a good heavy M2 or harder metal scraper to the wheel and sharpen it as normal. Make sure it is good M2 and not some of the cheap stuff from overseas. It most likely won't all come off at once, but with several sharpenings, it will be pretty much gone. Oh, don't do carbide to clean it. The build up is peeled away as you sharpen with the harder metals.