Try washing out the PEE, using an enzyme-based product (easily found in pet stores, and other places) usually nicely labeled something like "Pet stain remover". DO NOT use amonia or any amonia based product to clean the area, as this will just encourage your "naughty dog" to re-pee the area again.
My wife always uses vinegar in a spray bottle to neutralize the odor and discourage resoiling the same area. She starts by absorbing as much pee as possible in paper towels, then sprays vinegar liberally on the spot and around it. It seems to do the trick.