I recommend Arm & Hammer Cat Litter as it helps eliminate odor.
Don't mix urine and solid waste as that makes for more odor. Have a “toilet” for each. Add a tiny amount of Pine Sol to the urine to prevent urine odor and the Arm & Hammer cat litter to cover solid waste each time that potty is used.
I’ll make note of that, thanks .. sorry, have been lost in youtube .. lol