My mother's cat is now urinating around her apartment in an independent living residence. I told her this is not acceptable and she became very emotional about it. Her caregiver has gotten stuck cleaning it up. I live two hours from my mother. I think it is time for the cat to go. She said he is her only friend and denies he is actually behaving as I described.
Next, the areas that have been urinated on must be cleaned thoroughly with a strong smelling cleanser. After that, spray Lysol (linen scent is least objectionable) liberally where the cat has urinated.
The cat is doing this to mark it's territory or to complain about a dirty litter box. Or, she or he could have an infection. A vet visit is a good idea.
Don't break her heart by getting rid of her best friend.