Why are you having a discussion about cleaning with your wife? Just throw them on a heap on the floor. The only time you need to get involved in cleaning discussions is when she's not done it in time for your next ride.
(I say it doesn't damage the machine though). It all gets washed down the drain pipe and collects in the filter. Now when the filter needs cleaning out, *that* a mans job. Make sure you bring your entire toolkit with you and wear full overalls and big bobba boots. Spend a couple of hours looking inside the machine and sucking your teeth/shaking your head, drink about 4 cups of tea while you're doing it. When your wife has the audacity to question if you know what you're doing, give her a withering look and say it's a big job and she'll have to pay you in kind.
(I'm just going off what my wife says the plumbers always do at our house)