Pass by pass
| Pass | What happens | Purpose |
|---|---|---|
| Wet pass | Solution sprayed and extracted together | Rinse soil |
| Overlap | Each stroke overlaps the last | Even cleaning |
| Dry pass | Suction only | Remove moisture |
| Extra passes | On heavy soil | More rinse, then dry |
Avoiding over-wetting
- Controlled solution pressure.
- More dry passes than wet passes in many cases.
- Strong suction from truck-mounted equipment.
Before and after
Pre-treatment and agitation come before; grooming and drying after. See each process step and hot-water extraction principles.
Standards
The IICRC S100 standard covers professional carpet cleaning, and CRI tests extractors through its Seal of Approval. Book carpet cleaning.
