Told you...
A certain RAF Reg. Officer observing liquid oxygen replenishment "What causes this?" Says he, brushing his bare fingers over the delivery pipes... "Wouldn't do that if I were you..." "Really? Oh &@#$, my finger is stuck! What should I do?" "The recommended method is to p!ss on it, or ask someone else to oblige." "The alternative is to follow the advice of people who know what they are dealing with." Yes, he did speak to my boss, and I got the "official" bollocking with a grin... happy days😎