Don't rub his face in. He's just think you went nuts and enjoy rubbing his face in urine and might start to fear or get defensive around you. Dogs don't have a memory like humans do, they don't make those jumps of logic that we take for granted. Start with some basic housetraining again. When you take him outside, give him a threat if he goes outside. If you catch him in the act, grab him, say no and take him outside and give him praise when he does the right thing. Definately use the nature's miracle though and consider taking him to the vet for checkup. Sometimes dog will do that to get attention when they feel sick.