Paint splatter on slate - removal
Don't tell anyone I said this, but when all else fails the right magic marker makes things..disappear!
Cleaning paint off is tricky- always start with the least caustic and work up. Just good ol rubbing alcohol will soften latex paints- particularly fresh.
I have had some success with Krud Kutter.
Solvents won't work on latex, and water wont work on oils.
"It's better to come here with questions before you screw up than to come here after and ask how to fix them."- JS