errrr, u could try baby wipes or u can get grooming powder from pets shop which is surposed to help keep rabbits clean, or when i clean my rabbits feet for a show i buy have hydrogen peroxide the weak solution and dilute it 1 part HP to 3 parts water as its says on bottel which is used for gargeling and wipe a bit on it then put some cornflour on top then just brush it our l8er, if not H.P try whitch hazel
becky