Patrick Chase
Are you using laminated (Japanese) plane irons and chisels?

Homogeneous Western tools that are hardened all the way through are typically Rc59 and above, and that's enough not to clog a CBN wheel. I don't worry about it or clean the wheel at all.

Mild steels and iron can indeed load the wheel. That's only happened to me once that I remember, when I used my CBN wheel to shape some mild 1018. I ground a hardened scraper (~Rc52) a bit to remove it and the wheel didn't seem any worse for wear, though I've avoided unhardened metals since.

I don't hollow-grind laminated tools in any case. They don't really need it because they sharpen so easily to begin with, and I'm concerned that hollow-grinding slightly compromises the integrity of the weld. I don't know if it's enough to matter, but I don't take chances.