A Stain-by-Stain Guide to Carpet Spills

Almost every permanent carpet stain was made permanent in the first five minutes, and almost always by rubbing. Friction abrades the fiber tips, drives the spill into the backing, and turns a treatable spot into a fuzzy discolored patch. The universal first move is the same in every case: blot with a clean white towel, working from the outside of the spill inward, and lift as much liquid as you can.

The three rules that apply to everything

• Blot, never rub — and use a white towel so dye transfer from the cloth is not an added problem.
• Work from the edge inward so you do not enlarge the spill.
• Test any product in a hidden corner first, and never mix two cleaning products together.

Water-based spills

Coffee, tea, juice, wine, soda, and food: blot thoroughly, then apply a small amount of a mild pH-neutral solution and blot again. Red wine responds best to a dedicated red-wine spotter or a diluted oxygen bleach on a colorfast synthetic carpet — but never on wool without testing, because oxygen products can lighten wool dye. Club soda is not a remedy; it adds moisture and sugar.

Protein spills

Blood, milk, egg, vomit, and pet accidents: cold water only. Hot water coagulates protein and sets the stain permanently. Blot with cold water, use an enzyme product on biological material, and give it dwell time rather than scrubbing.

Oil-based spills

Grease, butter, cooking oil, cosmetics, and some sauces: these need a solvent-based spotter rather than water, because water beads off oil and spreads it. Apply a small amount of a dry-cleaning solvent to a white cloth and tamp — do not pour it onto the carpet, which drives it into the backing.

The difficult four

• Ink: isopropyl alcohol on a white cloth, tamped, blotted immediately, working in small sections. Never pour. Can spread if rushed.
• Rust: a dedicated rust remover, used sparingly. Acid products can damage some fibers and dyes, so testing is essential.
• Wax and candle drips: let it harden, break off what you can, then absorb the remainder with paper and a warm iron over the paper. Never scrape with a blade.
• Gum: freeze with ice in a plastic bag until brittle, then fracture it and pick out the pieces. Solvent helps on the residue.

What is genuinely permanent

Bleach, hair dye, dye-based markers, and anything that has been ironed or dried with heat are usually permanent because the dye or the fiber itself has changed. Sun fade and the lighter patches left by cat urine are the same category. A good cleaner can often improve the appearance but should not promise removal, and a company that promises everything comes out is telling you what you want to hear.