I don't know if anyone has ever used it on here, or if anyone has suggested it before, but if you have any stains or dirt on your Elky's carpeting, seats, or headliner, I recommend you to use Dri-Clean. It comes in an aerosol can (at least the one I was given is in aerosol) and after you vaccum the truck out, you spray it directly on the stain or spot. It comes with a brush that you use to brush the cleaner into the spot. After it dries, take your vaccum again and go over the area you sprayed. Depending upon how long the stain has been there or how bad it is, you might need to use it a few times, but it works! Just thought that maybe somebody on here had an Elky like mine, where when I bought it the seats were practically all brown :( Just spreading the word!
~Ger

Windex works too...even for dried on grease! I used it once to remove red wine from a grey carpet in a stretch when I was the GM of a limo company. I just spray it on very thick, then wipe hard with a clean towel.

Something else that i have found that works good is plain old shaving cream... It got ball point pen ink off my headliner! Worked well on the seats and carpet also. and it is CHEAP!