[souffle]

Dwarfs don't get wet tail so you are safe in that respect. Normally you can clean when all the pups have their eyes open and mum is happy for you to touch them and hold them. Place everyone is a big storage box with some toys the try and remove everything except the nest area from the cage. Wipe over with kitchen roll and pet safe disinfectant and replace with clean substrate. Put in a big platter of yummy food then put everyone back in so that they are occupied with the food and don't notice the clean cage.
We use a sand box (chinese takeaway tray filled with sand) and the babies wee in that which makes cleaning easier though you do need to clean it several times a day if you have a big litter!