I had Berber carpet at one time and, you're right, it's difficult to clean and sometimes difficult as well to find pee spots. Unfortunately, the only way for me to find pee spots is as you said, crawling around on hands and knees. Wear latex gloves, though. Not only is it more sanitary but you'll notice the difference in how the carpet feels immediately when you come upon the pee spot. I'm sure you know about Urine Gone cleaner but in the slim chance that you don't, give it a whirl. When Puddy was having such a tough time in her last days, sometimes she couldn't make it to the litterbox and believe me when I say that Urine Gone got every last trace of the stain and smell out. The important thing is, though, that you keep your spirits up the best you can. We're w/you. Keep the faythe.