For me this is a little bit strange...
I have done all this and much more over the years. Did I think it was wrong? Absolutely! But it's a cut thoat business and if you refuse it will go down badly against you. They really should not expect this of pilots but when they do I fail to see you have much choice if you want to keep things sweet?
How about taking out the portapottie (that the boss saved up every flight for) and having to clean that in a corner of the apron? Getting splashed in the face everytime! Really unpleasant. But when you have a boss that refuses to pay handling agent fees what alternative is there? Blatantly refuse and you are shown the door. It CAN be a neccesary part of this business?