Pet Urine Stains on Laminate Flooring

I have a laminate floor that is 3 yrs old. I got a new dog and he marks the floor when I leave home. I have wiped up the urine mess every time I come home, but it has left stains on the laminate that seem to be permanent. I have tried several cleaners that remove pet stains and they have done nothing. My floor looks terrible now. Is there anything I can use to remove these stain marks on my floor? Please help!

By Gary from AZ