We purchased the Urine Stain & Odour Remover Concentrate and I was quite sceptical as to how this would work. We have a courtyard with artificial grass that was quite smelly when our staffy started doing his business on it. We hosed it every couple days but that was only a short term fix. Now using the concentrate, I was amazed we don’t have that lingering wee smell anymore, which is awesome. I spray every couple weeks, due it being quite hot. Because our boy is an inside dog we use it inside as well. It works a treat to get rid of that “doggy smell” on the carpet and lounge. Overall thanks pet lab so happy and glad I have it a go 😊