Ever the scientist I just tried acetone on some cured spray can foam. (Great Stuff, controlled expansion in the blue can)
It softened it up a little but it did not get gummy or break down in a 5 minute soak. It might help you get it out of your clothes tho but if you have "plastic" clothes it might eat a hole in them.
Trichlorethane 1.1.1 is similar.
Lacquer thinner was even less effective.
This is polyurethane and there is not much that will eat it.
Dynasolve CU-6 says they can do it but this is pretty nasty stuff.
http://www.customlinings.com/industrial/ApplicatorsOnly/MSDS_Sheets/CU6_MSDS_SHEET.pdf
