discolored/stained carpet

I had a tiny roof leak that left a BIG red/pink stain on my white carpet ceiling. I fixed the leak, then created a sealed chamber around that part of the interior. Basically a lot of cheap plastic dropcloth material taped to walls, and covering floors to prevent overspray damage. I them took a spray bottle full of straight bleach and soaked the stain. I did a bit of blotting with a clean white towel, and ended up repeating the process a total of three times. The ceiling now is clean, and pure white.

Most RV carpet can handle the mild bleach found in a lot of cleaners. Pick an inconspicuous spot and test it, I think you'll find it works. I've used Clorox Cleanup on all my carpet and ceiling cleaning problems and it worked perfectly.

The Ozite ceiling in our bedroom is stained with soot at the seam between roof panels. Nothing I have tried to date will get it out.

We had a local carpet cleaner do our complete unit, including living room and bedroom carpet, under the driver's dash, couch and chair cushions. Cost us less than $100 and he came to our storage lot.

See http://newmarkountrystar.com/

Thank you all so very much for all the helpful tips! I'm a newbie ;)

Should be able to "feel" the difference between soot and dirt.

If soot, check the exhaust manifold and turbo area very carefully for an exhaust leak.

If the spots are not too large an area try using Folex. Available at Lowes.

I would make sure any seals around the access area are in good condition and there are no exhaust leaks on the engine.
Then I would try cleaning as recommended by jerseyjim.

I had a few stains plus a really dirty (overall) carpet. Found a indie carpet shop that advertized installed and cleaned carpets. Asked the owner about an RV carpet cleaning....he was receptive. Brought the motorhome to his place, 8AM on a Saturday.,Maybe an hour or so later, left with a carpet that looked just about brand new. 100 bucks

You might try that. g'luck !

After 17 years, a lot of that is from dust, dirt and heat coming up in the joints of the covers. You can probably scrub it, but most likely will be permanently stained.