Unflushable

You may have heard an old crank in a big house ranting about appliances and unflushable toilets the other day.

Source: wiktionary

The Sydney water team are hoping that by showing families the 'unflushable' and 'unsinkable' items, that the environment will be a lot better off.

Source: wiktionary

Recently, I asked Moffat about the "unflushables" gag -- which leads to one of the funniest jokes in the British show -- and he said flatly, "That was not taken out by me."

Source: wiktionary