I'm resurrecting this thread. For those of you looking to remove your pinstripe, I removed my effeminate purple and pink pinstriping today with a cheap travel hairdryer, goo gone, and ACETONE. I don't think it matters if you use mineral spirits, acetone, naptha or 3M adhesive remover. Pretty much just some type of solvent that smells like huffing it would be a bad (or fantastic!) idea will suit you just fine. GooGone works, but it's weak sauce.
I heat up the edge of the stripe, peel up a small amount with a razor blade, then heat up the ancient stripe ahead of where I'm peeling. Basically heat in one hand, peel with the other.
There will be a bunch of adhesive still left, but I used a sponge and would pour a little acetone on the pad, swab over the area and then use the gritty side of the sponge and gently rub. The more acetone the better, but I was running out so I would do small amounts.
Afterwards you'll have a bunch of tiny particles of adhesive left over. Acetone up your rag and wipe off.
Bam. Now your Ranger looks manly. Buff/Polish over the area where the stripes were and it should blend just fine.