Which product is everyone talking about -- they seem to have so many choices:  
http://www.simplesolution.com/produc...stain&odor.htm
They make an Oxy Solution -- says great to use on carpet.   
I too have a few stains that evidently went unnoticed.  But I usually get them up with the Woolite Pet stain remover.  If there is something better though, I am all for trying it.  I always wonder if some of these stains are coming back on me over time.