Hygiene: CIP, Washdown & Hot Water
The nightly clean is a hidden utility on every food and drink site: quantifying washdown hot water, and where hygiene rules leave room for efficiency.
10 min read · Jacob Willis, Net Zero Lead · Last reviewed July 2026
Every food and drink site runs a second, hidden utility that most industries don't have: the clean. When production stops, the washdown crews and CIP sets start, and for the next several hours the site consumes hot water, steam and chemicals at rates that rival the production shift's, to bring every product-contact surface back to a verified hygiene standard. On many sites a third or more of the gas bill is spent cleaning rather than making anything. This lesson quantifies the washdown and CIP loads, shows which parts are fixed by food safety and which are habit, and sets up the heat-recovery pairing that this course's final module cashes in.