This falls into the category of I’d-rather-be-riding-my-bike. But when the power goes out for the last time, you might want to have one of these devices in your garage.
Each time I am at the laundry mat, I find myself thinking about all the power that is used and one day I daydreamed of an alternate way. 60 seconds with Google and I found out my dream had already come true, multiple times. There are several versions of bike washing machines out. One idea is to take an existing washing machine and hack it (link here).