Happens in certain offices I work in (I'm a consultant). What I think happens is: Someone puts a number of items in the dishwasher, some of which wasn't used

Happens in certain offices I work in (I'm a consultant). What I think happens is: Someone puts a number of items in the dishwasher, some of which wasn't used at all, they came back on a trolley from a meeting. Next person comes, checks two cups and think it is clean and than put everything in the cupboard.