Sugar and lactose residue
The soil class that water alone removes — until it is heated, at which point it becomes one of the hardest things in the kitchen.
In detail
Sugars are the most water-soluble soil class there is. The dairy cleaning guideline lists lactose as removed by WATER, with no chemistry required at all, which makes it unique among the four classes it tabulates. That is true only while the sugar is intact. The same table records that lactose becomes more difficult to clean after heating, and the household experience of this is dramatic: a spilled drink wipes off, and the same spill baked onto an oven floor or a hob does not. Heating drives off water and takes the sugar through caramelisation towards carbon, and each step down that road is less soluble than the one before. The practical consequence is about timing rather than product. A sugar spill is trivially removable now and progressively less so with every heat cycle it survives, and no cleaner reverses that.
What works
Water is effective against Sugar and lactose residue Supported
The only soil class in the table that needs no chemistry at all — while it is still sugar.
Why
- Sugar and lactose residue is explained by Heat-set stains
Sources for this page
Sources
Dairy Processing Plants: Guidelines for the Cleaning of Dairy Plant Processing Equipment
British Columbia Centre for Disease Control (BCCDC), Canada · Government or regulator
Relied on for: That Table 3 classifies milk soil into lactose removed by water, fat removed by surface active solutions, protein removed by alkaline solutions and mineral salts removed by acid solutions, and that every one of the four becomes more difficult to clean after heating. (states this directly)
Verification: a person has read the passage relied on.
Read on — Part II: 'Cleaning Steps' (Table 1), 'Factors Affecting Cleaning', 'Soil Characteristics' (Table 3) and 'Water Impurities' (Table 4). Supports the claim as stated. Supplies a soil classification by removal chemistry, the first numeric water-impurity thresholds in the register, and a professional cleaning protocol with a temperature for every step.
Last reviewed by a person on .