Here is the clues you will need:

Dosh is a type of fake money on the world of Bin Weevils. This is a bit like Mulch but its called dosh instead. Dosh is much much more rare than mulch. Dosh is so rare that you can hardly get any of it. There is not many ways to get dosh either. Its easy for bin tycoons to get dosh but not for non-tycoons.