We use a body prep solvent, most of these contain xylene. Have used Megs solvent but never really had any luck with it doing anything at all. Automagic has a multi-purpose solvent that works pretty well.
Yes looks to me that someone previously cut all the way through the clear. There is really not much you can do to make it better, only worse. Steer clear it is what it is without a body shop.
The last time I warrantied my original G110 they sent me back a G110v2...a nice surprise because it was like a year ago and i was hoping they didn't have some extra G110s lying around
I actually prefer megs green apc because it foams more and doesn't run down panels as much. I do use both and don't really see a difference in cleaning power. My only suggestion is to go with plus if you are using on carpet or in an extractor hence the low foam.
Hydraulic fluid is probably it, i work at a jeep dealer and they do not come wrapped in any plastic. The stuff should come right off with some APC. Transport drivers arent the best at keeping their greasy paw prints off the vehicles