Best products for cleaning up after my dog

I’ve recently started bringing my dog to my girlfriends house because I don’t want to leave him home alone.  For some reason, he doesn’t like it there. Every time we go and visit, he marks the same corner in the kitchen. It’s really gross and the odor is getting worse because he keeps going there. I heard about enzyme based pet stain removal but I’m unsure about it. Maybe a more traditional  traditional solution would be better.  I’ve also found so many products online, I don’t know what to choose!. Does anyone have any preferences of their own?

I would definitely agree cleanex... the pet shop would be the best bet. Quinn, you did not mention... is it carpet or flooring. Make sure you use an ultra violet light as well... it will show exactly the areas you need to deal with. If you get a product with enzymes, make sure that the product is allowed to stay wet (cover with plastic if need be) overnight, then remove the product and let air dry. This way the enzymes can accomplish what they were designed to do and that is digest the urine salts.Use the enzyme product on the spot again and clean as directed. This should get rid of the stain and the smell... Good Luck!!