I noticed MEK mentioned. It will clean the snot out of monokote, but from my experience it also tends to dull the finish. I only use MEK when removing iron smear marks or when patching for this reason.

I've bailed on paper towels. Viva seemed to be the softest, but now I only use soft polishing cloths found at the auto parts store et. al. They don't scratch the finish and easily absorb oil. When contaminated, throw in the wash. I think they are about $8 for ten.

As for cleaners, anything that can cut the castor/synth oils used in glow fuel will work. Alcohol, Windex, etc. I actually don't use cleaners. I just wipe with the soft cloths. They remove the oil just fine and are a lot faster and less messy that spraying cleaners.

I also wax monokote. This may sound silly at first, but I'm convinced it makes cleaning easier not to mention it keeps the models looking better in general. I use Meguires Cleaner Wax about twice a season. While I have no scientific proof, I'm convinced the wax makes cleaning easier.