A tip for other owners of Travelpro bags. As per their website it seems all their bags have a so-called Duraguard coating which according to luggageonline is the same as a Dupont Teflon coating. This is to make them more water and stain resistant. The mfr website says to NOT use any soap or ordinary cleaning product on it. They recommend just water or 50/50 water and alcohol. I was happy to have found that as my ordinary reaction would have been to use some shampoo or perhaps vinegar or even simple green if it's really dirty.

See here
http://www.travelpro.com/care.cfm