The Chemistry of Cleaning – pH, provides a foundational understanding of how acids, bases, and the pH scale influence carpet cleaning. It begins with the basics of chemistry, explaining the structure of water, the role of hydrogen, and the concept of pH as a measure of acidity and alkalinity. Learners are introduced to ions, covalent bonds, and how the balance of hydrogen and hydroxyl ions determines whether a solution is acidic, alkaline, or neutral. This section sets the stage for why pH is central to cleaning science.

The second part of the course examines the pH scale in detail, showing how values from 0 to 14 represent increasing acidity or alkalinity. Real-world examples—such as fruit juice, coffee, bleach, and drain cleaner—help learners connect pH theory with everyday substances. The course also stresses safety, highlighting the risks posed by strong acids and bases, which can burn skin, weaken fibres, or cause chemical damage. By understanding where cleaning products sit on the scale, cleaners can better predict outcomes and hazards.

From there, the course explores how pH directly affects cleaning. According to the Australian/New Zealand Standard 3733:2018, cleaning chemicals must remain within specific safe ranges, both in use and after drying. This ensures fibres remain stable and free from long-term damage. Learners are taught how improper pH balance can lead to issues such as cellulosic browning in cotton or jute, yellowing in wool, or mineral residues from untreated rinse water. The importance of neutralising residues and maintaining a safe residual pH is reinforced throughout.

Attention then shifts to the fibre-specific tolerances of different materials. Synthetic fibres such as polypropylene and polyester can withstand higher alkalinity, whereas wool and silk are highly sensitive and require products that self-neutralise. Best practices include pre-testing detergents, using WoolSafe-certified products, and applying mildly acidic rinses to stabilise fibres. The course also outlines the potential for irreversible damage, such as de-lustering, dye bleeding, and fibre weakening, caused by misuse of strong acids or alkalis.

Finally, the course emphasises the balance between cleaning power and fibre safety. Alkalis are effective at breaking down soils but can destabilise dyes and fibres, while acids help neutralise and stabilise but can set certain stains. Students are encouraged to view pH not as a single solution but as one element of the broader cleaning chemistry that includes surfactants, emulsifiers, and chemical reactivity. By the end, learners gain the ability to make informed decisions on product selection and safe application, laying the groundwork for advanced stain removal techniques.

This Chemistry of Cleaning - pH course is suitable for beginners entering the carpet cleaning industry, as well as existing cleaners who want to strengthen their professional skills. It is ideal for those with little or no prior experience who need to learn the essentials of fibre identification, chemistry, pre-inspection, and safe cleaning methods. It also suits people planning to start their own carpet cleaning business, providing the knowledge needed to deliver consistent results and avoid mistakes. Experienced cleaners without formal training will also benefit, as the course offers recognised standards and best-practice procedures to improve credibility and customer trust.