Your cat's not peeing in your house to make you mad. Reasons cats urinate in the house include disease, dirty litter box, stress, and unfamiliar people or furniture. Time is critical when you need to remove cat pee; the sooner you treat the affected area, the easier it will be to remove all traces of the smell. You've got to use the right cleaning products on cat pee--certain products will not treat the odour.
Blot up the cat pee using paper towels or a cleaning rag when you notice the pee.
Mix distilled white vinegar and water in a 1:1 ratio in a bowl. Fill another bowl with warm water.
Dip a rag into the vinegar solution, then use it to rub the soiled floor boards. Rinse the vinegar using a second rag immersed in warm water. Blot up excess liquid with paper towels. Repeat this several times to thoroughly cleanse the area.
Spray the area with a special pet urine cleanser designed to remove all traces of the odour. These products are sometimes called enzyme cleansers; they're available at pet stores. Read the product label before you apply to determine how to treat the area afterward. You may have to rinse the cleanser away, or you may be directed to allow the area to dry naturally with the enzyme cleaner still on the floor.
Avoid using ammonia-based cleansers, because these won't remove all the odour, and may encourage your cat to pee there again. Website CatUrine.net provides a list of recommended cleaners that work well to remove cat pee odour (see the Resource section of this article for a link).