If you use lighter fluid and plan to put a new sticker on right afterward, you will need to clean the glass with acetone, and then isopropyl or denatured alcohol. The lighter fluid leaves behind an oily residue, and stickers won't stick to the glass unless it is cleaned again.
Rear side windows:

These 2 decals are from
Upstream Images (and no, I didn't pay $20 each)
Unfortunately, the "Gun Dog" one recently started peeling severely, and came off the last time I washed the truck (these pics are over 2 years old). Need to replace it.
Rearend:
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“Engineers don’t idle well.”
'99 Limited 4WD
Upgrades: BFG AT T/A KO 265/75/16, Husky floor liners,
WeatherTech window deflectors, Silverstar Ultra headlights,
TaskLED Dome lights, Red & White LED maplights,
LED tails & 3rd brake light, 35% tinted front windows,
TrueFlow air fliter, hardwired V1,
Scion T1807 HU w/ Aux input, Masterflow MF1052 in rear side storage
Mods: Deckplate/ISR, independent fog light control, rear diff breather, constant hot 12v outlets, seat-mounted LED Maglite