you can have the acetone a couple of mm deep if you want and do one side at a time. or totally submerge them. I think you MIGHT even be able to get them off with just the fumes but that might take weeks!
they will just pull off with no effort..
Yellow and blue schumachers dont get damaged by it, greens do if you leave them in too long (they go hard).
Foams in my experience don't really get effected (the foams I use) people tend to claim they do - but these people don't get all the acetone (and glue) out of the foams, they need to be totally wringed out. or even washed in some clean acetone after..
The thing that ruins foams is washing them whilst they have the aceton/glue still on them. the water hardens the disolved glue. they do baloon up larger than normal in aceton but shrink back down when dry.
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