For a while I kept foster cats in our spare bedroom. When a pair showed up with ringworm, I bought an large ionic air filter from Sears on sale.

This was to capture the ringworm spores, but I was very impressed by how much cleaner the room smelled. It was quiet, too.

I also used Nature's Miracle on those "accidents" and it works.

I'm sorry your friend said those things to you. I had a coworker with a super sensitive nose and she was just like that. She always said she couldn't help herself.

Good luck to you.