We bought an old car and we thought for sure the odor could be taken care of by using an ozone treatment. Unfortunately, after three attempts the smell kept coming back. We called Rudy over at Odor Cleanse and he came the very next day to do an Odor Shock Treatment. We couldn't believe it. It was like a miracle happened. The smell was gone and hasn't come back. That was two months ago! Next time Odor Cleanse will be our first call!