Hi,
Seems like there are a quite a few non-lovers of cats out there! There is a spray called bitter apple which can be purchased in any pet store. When sprayed on a surface or area, both cats and dogs will avoid the area as they find the smell offensive. The good news is that it is not harmful to pets and the smell is impervious to humans. Most people use it when their cat decides to use the furniture as a scratching post. It's inexpensive and should do the trick when sprayed in the area of your equipment. Of course, you will probably need to repeat the process as time elapses. Good Luck!