odor control

Hi there. I have 12 indoor cats and "accidents" do happen. I have heard of a product called Knock Out (?) to completely neutralize odors. Is anyone familiar with this product (or any other that works well?) I also have a spraying problem (half my furniture is covered in heavy gage plastic).

Has anyone ever Used Feliway? Does it work? Thanks for any help.
Anne

As for the NOK-OUT yes, I use it and I swear by it. I havnt had too many accidents but I have been able to soak the bed that got peed on in water and NOK-OUT and I got the smell out. I also use it as a neutralizer for cigarette smoke. I also hear that some breeders spray it directly on thier whole males and it helps.
I havnt had to use Feliway yet. I know a few people who have used it with great success. They did say that they had to be very religous about it though.