Yes, acetone will work but so will the IPA, so if you already have that then press on with it. If/when it runs out, a can of acetone from the hardware store will be a lot cheaper! Hardener is rather nasty stuff (more so than the resin in my opinion) so do be careful when cleaning it out. Lots of paper towels and disposable gloves, and wrap up the waste before binning it.
Good luck!
Greg