At WestJet, the customer service agents run through with a hokey (a small non powered vacuum type thing) to pick up crumbs and pieces of trash. The rest of the crew helps out to cross seat belts and pick the large trash out of the pockets. Also, employees traveling on STBY are required to help at least to cross the seatbelts (hey, these planes belong to all of us!) The provisioning agents (CARA in YYZ
) take the trash bags out and all this is done during our 30-45 min turn. It is not uncommon to see Pilots, CSA's, F/A's and Maintenance cleaning the plane, all at the same time... WestJet saves money and we see it in our profit sharing cheques. Of course at night, we have a regular crew that comes in to do a much more thorough clean.
I hope that helps.