In reply to rubbercrumb:
Alcohol. I use MEK <nasty stuff> for some jobs but usually IPA <isopropol alcohol>
You'll prob not have any of those but meths is good, it'll soften gunge then evaporate away taking any solvents in the gunge with it. Clean up any residue afterwards. Vodka would work at a pinch but not as good as its only 40% ish alcohol, meths is 90% or so