I never got a reply to my email to the company that makes the Stink Out product for dolls - which is always good indication not to pursue.
In the mean time here is the best method I have used to clean years of grime and smell out of old thrift store dolls & clothes--- highly concentrated Oxyclean! A few years back I searched the internet for solutions to get smoke smell out of a plastic dress form I bought and Oxyclean showed up the most often with rave results for eliminating smoke, mildew and other smells from plastic toys, lawn chairs---- anything that could be soaked for a long period of time. (A paste was made for items too big to soak.) So this is what I do: This method is rough on hair, so don't soak good hairdos!!. Fill the bathtub or a plastic bin with enough hot water for the dolls to be submerged, add a quarter cup or more of laundry detergent - preferrably one with enzyme action like Era or Wisk, but definatly not one with bleach, and about 20 scoops (or more) of the Oxyclean. You just have to judge how much according to how many dolls you are cleaning. I am basing this on at least one layer of dolls in a bathtub with about 4 inches of water. This solution will not hurt the dolls, but it will eat the metalic paint off of plastic earrings and crowns. I use a generic Oxy product called Sun Oxygen Cleaner because it is cheaper and has more fragrance added. I soak the dolls for several hours or overnight. Most of the dolls come sparkly clean this way without me even having to scrub them.
If the dolls are particularly stinky, I pour a cup of Febrease in the water about 30 minutes before I am ready to rinse & dry. Drain the tub and spray the dolls off with water from the shower head then fill the tub again to give them a good rinse and drain again. Now you have to make sure all the water is out of the insides of the dolls. I take the heads off of the ones that I can and dry them upside down. If heads have to stay on you have to squeeze the water out. I shake the hair to dry it some, then stand the dolls in boxes in the garage to dry. I turn them every few hours to check for any water accumulations. And of course make sure they are 100% dry before storing. I don't do anything with the hair at this time. When I am ready to fix up any of these dolls, I then soak the hair in fabric softener and rinse before combing and styling.
I have also put a couple of dolls that had badly stained sewn on costumes in that same soaking solution -clothes still on doll and all, swished them around a little, then rinsed and put on a stand with the costume fluffed out to dry. The stains came out and the costumes looked great. Again - no gaureentees ever so only do as a last resort and if it is okay if the costume gets ruined.