I have heard great things about the Spot Bot cleaning machine. My only worry is that most of my stains are urine stains from my Chihuahua and sometimes I don’t find them in the house until they are up to a week old. (He is very sneaky) These stains are impossible to get out and I don’t want to have to pay for new carpet when we move out of our apartment. Has the Spot bot worked on any old stains for anyone else??