I feed a feral and a stray cat on my back deck every day. I've never had any trouble with them and really enjoy it. Then a new cat showed up - big, sleek, and a bully. He started chasing my other cats away, taking their food, etc. This is bad enough, but he's positively covered my deck in cat urine. He's sprayed the doors, the grill, and the railing. He's a big, healthy cat and doesn't need my food and I don't want to encourage his presence. I don't know how to deter HIM without deterring the stray/feral that I *want* around. I've tried spraying bleach on the affected areas but he just re-sprays. My deck steps to the ground are very rickety and need to be replaced, so I don't feel safe going up and down those steps to move the daily feeding location...and I'm afraid if I just leave food out and hope that "my" cats find it, he'll come and take it. He's started spraying in my carport too. This has to stop...we're going to be selling our house in about 6 months and can't have the whole outside reeking of cat urine. But I want to continue to care for these other cats. Any advice??