Yes I agree about the greens. Also when grooming do be very gentle as buns have very thin skin and it's easily damaged. Try to groom regularly, depending how fluffy he/she is. Also, you will need to get some special scissors if he/she is very fluffy. If you aren't confident doing this yourself a vet nurse will sometimes trim them for you. I had a female lionhead angora cross who used to get a really messy bum and i took her to the vet and then would shave her back end (not totally!) it helped to keep her clean.