Digital BW, The Print

I have been imprudent and let a 1400 sit with Carbon 6 for too long. 
What is the best way to unclog the heads? I do have Paul's Clear Base at 
hand, since I mix the inks myself.

Does anybody know what the active ingredients in Windex or Simple Green 
are, since I don't have those brands in Switzerland? (Or what additives 
to avoid...)

Many thanks
Louis