I work for a Fortune 500 company, though our small division has some waivered policies, and I'm never sure which is Big Corporate and which is Little Corporate.
Our policy is travel home on the weekend for international travel, which is all I ever do. We can stay over the weekend if we want, if staying over is less than the airfare home.
Supposedly we have to wait 10 days before we're allowed to charge for laundry, which seems somewhat arbitrary to me. I usually go to the laundromat weekly while on travel, and it ends up being about five bucks, plus whatever dry-cleaning is.