Pre-treatment
Treating a mark before the main process, because the main process is usually the thing that would make it permanent.
In detail
Pre-treatment exists because most cleaning processes include a step that sets stains. A wash cycle heats; a dryer heats far more; a dishwasher heats and dries. Anything protein-based, and several dye-based marks, become permanent when heated, so the sequence has to deal with them before the heat arrives rather than relying on it. That is the whole argument for the step, and it explains its two rules. First, pre-treatment is cool: hot water applied to blood, milk, egg or gravy denatures the protein and locks it into the fibre, which is why the trade instruction for blood is cool water and why hot water on a blood stain is simply the wrong move. Second, it is not a substitute for the wash — a pre-treated garment still needs the full process, and a pre-treatment product left to dry on a fabric can itself become a mark. On soft furnishings the equivalent of pre-treatment is the carpet institute's shared opening: blot liquids, scrape semi-solids, break up solids and vacuum, all before any solution is applied. Every one of those is a step to stop the treatment making things worse, rather than a step that cleans.
What works
Pre-treatment is effective against Blood Supported
Why
- Pre-treatment is explained by Protein denaturation
- Pre-treatment is explained by The four variables
Sources for this page
Sources
Spot Solver: spot and spill removal procedures
The Carpet and Rug Institute (CRI) · Trade or professional body
Relied on for: That every procedure opens by blotting liquids, gently scraping semi-solids and breaking up and vacuuming solids before any solution is applied, and that acting quickly prevents a spill becoming a permanent stain. (states this directly)
The Woolmark Company · Trade or professional body
Relied on for: That prompt treatment before washing is the trade's instruction for stains on wool. (states this directly)