When you say bags, do you mean the suitcase type things that we either carry on or check in?.
Why on earth would anyone clean them? Just don't make them dirty. i can't remember ever feeling the need to clean them........I just use plastic bags to put dirty stuff in, inside the bags.
This I learnt when playing rugby, when the kit and boots were often dirty and smelly. The only useful service that plastic bags have ever done for me. .