Mineral spirits is what i used after i peeled most of the old stuff off with a detailing rasor blade (short blade witthe backer so it won't bend in shape.) carefully sliced the majority off and then poured spirits onto a microfibre cloth and rubbed away the remaining bits. Because it evaporates fast it leaves no residue.
also great for preping the roof seams for new caulking as well.
2009 Heartland Sundance 31.5 XLT bunkhouse
2013 Ford F150 XTR ECOBOOST
"Of the troops - For the troops "