Will the cosmo just float to the top?
I reuse the mineral spirits until it starts showing to much dirt. My experience is that most will sink. It's entirely possible that some of the cosmo will just get desolved. I use to work with fresh
comoline and I know that it will desolve quite easily.....
Occasionally, while soaking, you might want to slosh it a little to loosen it up more.
I miight suggest that you take a small sample and drop it into a small container of mineral spirits. Please let us know how you make out. ...
Be Safe !!!