I know people stress over the pollution aspect of gas, but I use gas in a tray outside to clean off old glue before taping.

I fill a metal tray just enough so it covers the rim but not enough so it covers any stickers on the inside of the rim which would destroy stickers.

Usually less than 2 full cups of gas. Tray is placed in the shade so gas doesn't evaporate. I do it when I'm working outside anyway. Turn wheel about every twenty minutes or so, wiping as I go. Brings it right back to the bare metal and then I wipe it with rubbing alcohol on a rag. On goes tape.
I figure if I drive to grocery store I'd use more gas, and once wheels are taped and new tires installed I'll bike for glsmall grocery orders which saves gas.

Also, I don't know if anyone suggested this before but I use my old VAR truing stand to install tape. Easier to center tape using that.