I was trying to fill a gap between a threshold and porch after having a new Bucine bluestone porch installed (a new door was supposed to have been installed, negating my intervention...but, supply chain issues).

I used Great Stuff. I didn't lay down a dropcloth like I should have, not realizing the residue is nasty, and got some on the bluestone.

Reading the literature I saw acetone was a solution, needed to be applied before cure, and that acetone (supposedly) was stone-safe/evaporate quickly, was colorless. I tried soap and water, (non-metal) bristle brush, and plastic chisel first to no avail and turned to the acetone with a microfiber cloth. I scrubbed it off (and likely, in)

Now it looks discolored. I've contacted Unilock for advice--and would have waited yesterday if time was critical) but what can I expect here? Am I screwed? Is this permanently discolored?

It is a new porch. I was trying to do good maintenance, and I mucked it up :(