I brought my 1st one about a year ago and I got another one because I do love it but I HATE that I can never clean it 100% it has water stains that I've done my best to get rid of. It is in my motor, all around the water bowl, the side arms to hold it in place and there's a little rust on the inside of the cone on both units?! I use bottle water instead of tap which has helped but I can't get the hardwater spots off. I don't want to change to a different fountain because our cat's love the free flow. I replaced some of my parts for both and I'm getting ready to replace both motors. What do I do to clean up my once beautiful fountains and keep them from rusting under on the inside? I don't want to scrub them with anything harsh because it leaves scratches on the stainless steel. Please look at my picture below and you'll see what I'm talking about. It's hard to see but it's the same inside of the water bowl too.