No more tension regarding the cleaning of underwear for weeks, as a new SELF-CLEANING Fabric is created. The scientists at the U.S. Air Force, has used this fabric to create underwear and T-shirts, which can be worn continuously hygienically for weeks.

This fabric would be godsend to sportsperson, trekkers and other people working in dust. The creation of this fabric could make the mucky football shorts and filthy rugby shirts a talk of past.
The Self-Cleaning process works efficiently to clean the fabric by repelling water, resisting stains and for hygienic and odorless clean: it kills the bacteria. With this special feature, this fabric will be clean for weeks without any wash.
This 'self-cleaning' technology has now been licensed to a London company, Alexium, to develop for civilian applications.
'We are expecting sportswear to be one of the biggest areas where this technology will be used," said John Almond, a director with Alexium. "We can treat almost any surface to take on a range of different properties that work side by side.
"We are now talking to some major sportswear brands to use this technology, but there are hundreds of other applications we are investigating, from hospital bedding and nurses' uniforms to air conditioning filters on planes and cruise ships."
If you are, an avid reader then you can also read a science fiction by Neal Stephenson, which talks about a nanotech fabrics 'fabricules' in his 1995 novel 'The Diamond Age':
...with a quick brush, John and Gwendolyn were able to transfer most of the dirt onto their white gloves. From there it went straight into the air. Most gentlemen's and ladies' gloves nowadays were constructed of infinitesimal fabricules that knew how to eject dirt...