When I had my attic urethane spray foamed, we had not yet taped the ceiling MgO board. The insulation dude said it would not come through. Well it did and got on the acid stained and polyurethane floor. I am having trouble getting it off. Any suggestions?

Try using the cleaner for spray foam guns. The cleaner that I bought for the spray gun I have also comes with a spray nozzle.

Acetone, but try it in a small out of the way area first