I think I need to caveat this question by saying that it came to my whilst I was putting my washing away and not because of any other reason. If necessity is the mother of invention, how come we haven't invented self cleaning underpants?
Good question and Not enough demand tied with 50% of the votes each from the following selection:
I'm not sure there wouldn't be enough demand. To be honest, I think this is a multi million dollar idea. I did consult with Mr O this week to get his thoughts on the design of the self cleaning underwear and his main concern was that the user might suffer injury if they engaged the scraping mechanism whilst wearing them. A valid concern is this litigious world that we live in. If you did manage to create such a device, I guess you'd need some kind of insurance to prevent you against claims from people who had lost their tackle during the cleaning cycle.