Agitation
One of the four variables in every cleaning process, and the one people reach for when the other three are wrong. More force is rarely the missing ingredient.
In detail
Cleaning trades off four things: chemistry, temperature, time and mechanical action. Reducing one usually means increasing another, which is why a cool wash needs a better detergent and a longer soak needs less scrubbing. Agitation is the variable a person controls directly and therefore the one they increase when something is not working, and it is the one most likely to damage the surface rather than the soil. The sources are consistent about where its limits are. The carpet institute instructs working the solution in gently and explicitly not rubbing, working from the edges of a spill inwards to prevent spreading. A furniture manufacturer and the leather institute both prohibit brushing and rotary-brush vacuum attachments, because brushing permanently changes a napped surface. The aluminium standard warns against excessive abrasive rubbing, which produces an undesirable appearance even without visible scratching. The wool trade makes the same point with a different tool: heavy pressure makes a sweater shiny, which is burnishing rather than a heat mark. Where agitation helps, it is usually more contact time at low force.
Why
- Agitation is explained by Mechanical action and abrasion
- Agitation is explained by The four variables
- Agitation is explained by Gloss and light scattering
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 the solution is worked in gently and not rubbed, working from the edges of the spill towards the centre to prevent spreading. (states this directly)
The Woolmark Company · Trade or professional body
Relied on for: That heavy pressure with an iron makes the surface of a wool garment shiny, which is a burnishing of the fibre surface rather than a heat burn. (states this directly)