Homemade cat repellent.
Try putting crushed red peppers on the counter, or Rosemary Essential Oil - cats run in fear. You could try mixing a little of the rosemary or crushed red pepper with water, and mist it onto areas that are problematic.
You could also try some crushed garlic, cayenne, sugar, water, lemon, cinnamon. That is the best one. Cats hate it.
20 drops of lemon oil
10 drops of capsicum (Liquid) which is cayenne pepper
20 drops of eucalyptus oil
1 quart Water
Mix, shake well. May be sprayed on furniture, carpet, upholstery.
These are approximate amounts. Experiment.
Here's a site that might help: