Those colorful dyes that give JELL-O its vivid color can also stain the carpet if a spill isn't treated right away. Remove that colorful concoction by applying a mild soap-and-water solution, followed by a vinegar treatment. The sooner you act, the greater the chance of stain-removal success.
Scoop It Up
Remove as much of the JELL-O as possible by scooping it up with a spoon. Keep a bowl handy to deposit the gelatin. Scrape and scoop from the outside edges of the JELL-O toward the center -- this way you won't spread the JELL-O problem. Once you've scooped up as much as possible, wet the affected area just enough to dilute the stain a bit. Blot -- don't rub -- with paper towels to remove some of the JELL-O dye. Keep blotting until no more dye comes up.
Pour a small amount of club soda over the stained portion of the carpet. Allow it to sit for a minute or so.
Blot the wet carpet with a dry white cloth to lift the JELL-O stain out of the carpet. Continue dabbing with a fresh area of the cloth until no more dye comes up.
Mix a squirt of liquid dish soap -- 1/2 teaspoon or so -- into 1 cup of warm water.
Dip a white cloth into the soapy solution and blot it over the spot on the carpet. For a large stain, wipe from the outside of the stain toward the center to help remove the Jell-O coloring. Continue wiping or dabbing until you've removed as much of the stain as possible.
Mix 1 part white vinegar to 2 parts warm water if any stain remains.
Dip a clean white cloth into the vinegar mixture and dab it over the stain repeatedly to lift any remaining tint.
Pour a little cool water over the area to rinse the carpet fibers. Use as little water as possible to avoid moisture damage to the carpet pad or floor. Blot the area with paper towels or a dry white cloth to remove excess moisture.