I was naughty and washed mine with fairy liquid today
The worst thing is that I have all of the potions, gummins and apparatus to wash, wax, polish and generally fettle a bicycle, because I also own a motorbike. Unfortunately the above-mentioned stuff is 80 miles away at my mum's house, while the motorbike hibernates for the winter. Down here, the bike lives in my living room and all I have is a bucket and an old washing-up brush!
My penance will have to be to get up early in the morning and get myself to the shops for suitable supplies, so I can wash it properly in future...