Hi there,
Stalosan is a dry powder disinfectant which you sprinkle and leave down. It helps to dry out the litter and really does reduce odour. It is about £15 for an 8kg tub and will last you ages.
Another option is to pave the run and then put a layer of bedding on top of the slabs. This way it is easier to keep clean as you are not fighting mud but the birds still have chippings or straw to scratch about in, |