Litter robot 4 smells?

I’ve been having the litter robot for about 2 months. However, when I near it it just smells! I took the globe gave it a good cleaning with soap now the next day it stinks again. I currently use arm & hammer clump & seal litter with cat deodorizer mixed in. I even tried adding the deodorizer to litter bin. Any advice or tricks would be appreciated! :)