Carpet extractor
Injects solution and pulls it back out. What it recovers matters more than what it applies, and what it leaves behind is what causes the next problem.
In detail
An extractor sprays cleaning solution into a carpet pile and immediately vacuums it back, along with the soil it has suspended. Professional guidance reaches for one first on any large liquid spill — get the liquid out before it reaches the backing — and a wet/dry vacuum does the same job for the initial pick-up of urine or a burst spill. The machine's limits are the interesting part and they explain most of what goes wrong afterwards. Extraction cannot remove everything: soil left at the base of the yarns and on the backing is exactly the reservoir that produces wicking as the carpet dries, and moisture that reaches the padding can sit there while the pile feels dry. Anything the machine puts in and does not take out becomes residue, which is why the standing professional instruction is to finish with a clear-water rinse only after no evidence of the stain remains. Domestic versions of the same machine exist and are genuinely useful for the rinse step. The professional difference is recovery power and the operator's judgement about how much water a given carpet can take.
What works
Carpet extractor is effective against Urine Supported
Why
- Carpet extractor is explained by Why a stain comes back after it dries
Sources for this page
Sources
Consumer Floor and Furnishings Care Information: carpet topics
Institute of Inspection, Cleaning and Restoration Certification (IICRC) · Trade or professional body
Relied on for: That a large spill is extracted with a wet/dry vacuum or carpet extractor before spotting, that a wet/dry vacuum is used for the initial pick-up of urine and to extract rinsing agents, that a home spotting or carpet cleaning machine rinses with clear water only after no evidence of the stain remains, and that soil left at the base of yarns and on the backing produces wicking. (states this directly)