This myth comes from shampoo-based and low-rinse methods that leave detergent behind. Detergent residue is sticky, so it grabs soil and the carpet looks dirty again in weeks.
Hot-water extraction with a full rinse doesn't have that problem. The soap goes in as a pre-spray, does its work, and comes back out with the soil.
What to ask any cleaner
- Do you rinse, or is it a shampoo/bonnet method?
- Is a pre-spray and dwell time included, or is it just hot water?
- How long until I can walk on it? (4–6 hours is normal, 24 hours is too wet)
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