I wouldn’t treat anything else like my work mug. It never ever has a proper wash. Will rinse it in a sink maybe every fortnight, give it a bit of a rub with some blue paper. I only have black coffee in it so I reckon I’ll be ok but it’s not really acceptable behaviour.
my old boss used to insist that the grime/stain added to the flavour of the coffee and he was absolutely gutted when a new cleaner came in and gave it a deep rinse, presumably with vinegar or acid, and it came out sparkly white. was like he’d been building a matchstick pirate ship for years and someone had knocked it over
appalling. Rinse it with cold water (no hot water tap available) and rub it with a filthy sponge that’s been here for months. Maybe once a month I’ll squeeze a bit of washing up liquid on to the filthy sponge as well.
My mother in law got me a hideous penoid mug for Christmas and we gave it to the chazzer without even taking it out of the box. It said GAMING in it in big letters and the handle was in the shape of a PlayStation controller.