Carpet cleaning looks harmless until an inspector asks for the paperwork. This guide sets out what COSHH expects for carpet cleaning chemicals in hotels and HMOs, using HSE guidance: the five-step paper trail, storage and decanting rules, dilution, protective equipment and first aid. It includes a worked 20-room hotel example with Rug Doctor dosing and cost per tank, plus current Rug Doctor chemical prices checked on 22 October 2026.