Cats are very sensitive to different. Though you may use scented cat litter, deodorant powder or neutralizer to try to the smell of the litter box, they may not be safe for your cat.
This could result in your kitten not wanting to get close to the litter box. So this product is very essential.
Activated Carbon Filters Cat Litter Boxes Charcoal Filter Cat Litter Pans Filters for Cat Litter Boxes and Pans
Cut them into various sizes to fit litter boxes, suitable for majority of litter boxes, to get rid of.
A good solution to solve the litter box unpleasant smells problem, do the good to remove, maintain fresh and clean smells, keep with good health and mood, make you live a happy life with.