1st, try to eliminate/reduce spatter through electrode angle, lower amperage and management of magnetic arc blow.
2nd trick is to use a scraper or chisel.
3rd is to be mindful of direction of rotation when using these tools.
4th, 10K rpm is going to have some "kick back" under certain articulations and weldment geometry. Glove up, leather up and learn to handle these tools with authority.
I have one at home and they are very good grinders.

I have a couple of those and love them.  But, be careful in tight places and corners.  Safety first, last, and always.

He Is In Control, Have a Great Day,  Brent