A medium or fine Índia stone should do fine. I doubt there are any burrs there on the ways. If you aren’t sure after you clean the rust off use a 123 block or parallel and move it along the ways and see if it gets caught if so you have a burr and you will then need a stone. The stone is useful for stoning your table and bottom of your vises aswell.

Also I’m sure your paint was somewhat messed up already but that looks like fresh peeling and bubbling from that cleaner. If I ever move away from QualiChem I’ll remember not to touch that stuff with a ten foot stick.