Steve and Madie. I took the step of buying some bells and just knocking on the doors of my neighbors and asking them politely, if they wouldn't mind putting one on their cats collars. When I explained the reasons, nobody had any objections, least ways not to my face, and together, with the same kind of perimitter fencing used by Maddie, the birds are gradually coming back. I used a number of those green metalic sticks that B&Q sell for about £1.20 each. I 'planted' them about six feet apart and tied green twine to them, starting at a couple of inches off ground level. and going to about three feet with six inch gaps. I've also put bells on the twine and this is working very well. It blends into the background, and the twine can be easily moved up and down to enable me to cut the grass etc. Personally, I wouldn't use a high pressure hose on a cat. They are just cats being cats and don't know any better. Try the above Steve, and as others have said, get the feeders away from overhanging tree branches. Think like a cat, and see how difficult you can make it for yourself, (as a cat of course!)