I sometimes have to rewash my bags. I have some that I use to tote dinner to work and that gets messy. I guess you could just say that with use some bags have to be washed again after a while. They lose their shape. They get crumbs and things in them, suncscreen residue, dirt and scratches. Also occasionally if I don't get a spot out completely I might come back and rewash a bag later. I have a couple I would like to do that to right now. I should do it since I'm trying to take a break from buying to prune back my collection a bit instead.
I have a different rehab habit to you houseof999, I tend to wash my bags as soon as I get them, I often can't wait! It's the fun bit. It's selling them I never get around to, even if I've made up my mind to do it.