I found this on the eat-l list and tried it and it is awesome! it is from public television’s pledge drive featuring graham haley’s hints, one of which is for a carpet cleaner. i tried it and am now a big fan — so i am sharing it below.
(i couldn’t get a huge lather, and the book doesn’t say anything about that — and it worked fine.)
graham haley’s carpet cleaner
3 tablespoons dishwashing liquid (e.g., Ivory or Joy) 1 teaspoon distilled white vinegar 1/2 teaspoon household ammonia 3/4 cup water
Pour dish soap vinegar, and ammonia into container. Add water. Beat well into later (easiest to put into “foamer containers” you can shake, but can use a rotary egg beater).
Apply foam (JUST foam, not the liquid) to carpet. Rub in with sponge.