Foam Sanding Block

I scraped most of what I could before it dried, but it is still very evident. What can I do to remove it? I tried sanding with a wire brush, but it just ruins the wall. Please HELP.

Try 80 grit sandpaper and be prepared to repaint the affected areas.

Good luck

Gasoline should work, it melts foam. But lets get to the important question, did you watch EXPLODDE? Kool

If you have tried a wire brush and does not work, go to the manufacturer's website and ask them. Link below.

Masonry is easy ... ASID muratic use at a dilution rinse ... thougoly w / water ... deny with soda ..