Maybe he doesn't like the location of the box in the bedroom. You can also try Cat Attract brand litter.
I read in your other thread that you are washing the blanket with Nature's Miracle...are you using their laundry detergent? Or just adding regular Nature's Miracle to the water? If the latter, then that isn't going to do the job. Regular Nature's Miracle needs to be applied and allowed to dry.
If it's the same spot on the bed, I wouldn't be so sure some pee didn't soak in or there isn't some level of residual smell. Treating the sheets and mattress won't hurt and may help.
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Holly, Misty & their friend, Jake, the dog.
Onyx, Callie May, Maggie & Kobi forever in my heart.
Yes, I know I need a new signature pic...someday...