Just wash if it stinks la, it's not as if it's an option to go around being a stinky photographer.
If the sweat smell is really bad, baking soda works wonders. Just leave it on for a bit after wetting the bag, and then wash it out. The smell will be removed (at least for a while, depending on how bad your sweat is).
yes. I do. Turn it inside out, whack out all the dust and sun the whole thing once in a while.
and once in every long while, i do send it to Colourwash or similar to be cleaned up. Why Colourwash is simply because they have the expertise to handle leather etc and I'm worried my billingham will fall apart if i just throw it into the washing machine
I never wash my bags but there was this once I discovered fire ants crawling all over my Domke, I had no choice but to dunk the whole damn thing into water. Water just ruined the bag and I had to write it off.