I don't spill stuff on it. I believe the stains come from two places.
1. Tracking in the kitchen (where shoes are allowed) to the living room (where they aren't) somehow dirt from the kitchen gets on my socks or something and then I track it in the living room. I am not sure what I can do to remedy this.
2. When the cat gets sick, she vomits on the floor. Sometimes it comes up cleanly, sometimes it doesn't.
Then there is this black marks from the rug dr that never came up.
But you are right...this carpet cleaning is only temporary. But I am sure the laminate flooring has its issues...I just don't know what they are quite yet.