Hi ive a job at a manufacturing company where the use biocide and minncare its a blueish vinyl floor and has only been down 1 year they use these two chemicals quite often however their is a brownish stain over the whole floor and mainly around the edges where the guys have used a wet rock which couldnt get in to the edge has anybody come across this and anything to remove could you call me 07711 05 6060 Jim thankyou.