Hygiene: CIP, Washdown & Hot Water
The nightly clean is a hidden utility: quantifying washdown hot water, and where hygiene rules leave room for efficiency.
10 min read ยท Jacob Willis, Net Zero Lead ยท Last reviewed July 2026
Every food factory runs a second, hidden utility that most industries don't have: the nightly clean. When production stops, the washdown crews 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 cooking. 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 later lessons cash in.