Yes, Peter and All; my response was strictly informational to PhotoEngineer. Guess I should have sent it as a PM, but I didn't...
I DO NOT recommend you use perc (as we call it); it is carcinogenic and we wear organic vapor respirators when handle the stuff and have a routine medical monitoring program that does an annual battery of tests to chart blood protein levels and other variable to make sure we are not sliding over into Cancer.
Not a good chemical to mess with; somewhat on par with Carbon Tet.
I'm glad that you mentioned it. A brief search pulled up some interesting info on it.