same old same old

My day has been spent having conversations much like this from The Young Ones:

Mike: Maybe you shouldn't have poured that washing up liquid into it.
Vyv: But the manual said: "Ensure machine is clean and free of dust before use."
Mike: Yeah, but it didn't say: "Ensure machine is full of washing-up liquid."
Vyv: Ah, but it didn't say: "Ensure machine isn't full of washing-up liquid."

I've been emptying a lot of washing-up liquid out of machines.