Ok, so if you are not using an enzyme cleaning, you need to. Try anti icky poo. You can order it on amazon. If he is going in that many places, buy lots. If you don't use an enzyme cleaner, he will just keep going back over and over.
Bedding and litter boxes. When was the last time you completely changed the litter, and washed the box? Definitely try cat attract, but you may need to buy new boxes, depending on how dirty the box(Es) are. I have one boy who is fanatical and won't use the box if. It isn't sparking. How many boxes do you have? Where are they? Are they open or covered? Is another pet or family member blocking him from getting to the letterbox?
Question. How are his paws?
Second question. Is he peeing down or up/sideway? I.e. At a wall, or at so,etching that is underneath of him?
Third question. Is he still pooping in his box?