
Hi Katie, Isabel has pretty much covered things for you ;)
Definitely restrict indoor access - wandering into other rooms unsupervised will be a no-go for a while & follow Isabel's regime of re-training to toilet outdoors. I expect he's learned the word "no" or "ah-ah" by his age ;) so watch him like a hawk and if he's *scent marking* use one of those words to stop him mid-flow, take him outside, and clean the area (floor or fabric) immediately with a mop or spray of solution below.
Hire a pro carpet shampoo machine and blitz all carpets, rugs and importantly any areas of underlay below same that he's "annointed". After doing them with the solution provided, go over the problem areas again using bio washing powder and water to remove the keytones, scent etc from urine sprayed areas including curtains & woodwork. Mop over these areas yet again (AND re-do underlay) with a dillute solution of white spirit. It will take a bit of work but save recarpeting the entire house :P This WILL work with patience and perseverance on the part of the *entire* household. Good luck, Teri :)