Cleaner ignored 'do not use tap' sign, destroyed phone systems ... and the entire building

The natural enemy of the IT pro is the builder – they’ll cover you in dust, hose you down, or worse
On Call Well, look at that: the clock says it's Friday morning so it must be time for a new installment of On Call, The Register's weekly column describing readers' triumphs over adversity, mendacity, and stupidity.…