Feliway Spray (safe for fabric and many other surfaces). It's only available at some Vet Clinics in Canada with no prescription. I picked up mine at Brandon Animal Clinic - 2015 Brandon Avenue. Well worth it. It's used for calming, spraying, scratching, anxiety, stress, etc. It's an odourless pump spray containing pheromones that mimics the cats natural pheromones. There are also room diffusers as well (doesn't affect anything but the feline species).
You could spray Feliway on your curtains or any affected areas cats like to scratch or damage.
Here is a link to read up on it.
Best of luck. Worked well.
http://www.feliway.com/ca_en/#redirected
Edited by Kellye, 2016-04-27 09:57:28