Smelly litter

[Kittiesue]

Hello
I wondered if anyone has any advice for me. I have sold my house and moved in with my son along with my two very nervous cats. He also has two cats and so at the moment mine are living in my bedroom with their litter tray. I am really struggling with the smell. I clean it as soon as it's used and have bought some litter powder deodorant but this doesn't seem to be working . In the morning when I wake up the smell in the room is just awful. Does anyone have any advice or practical ideas I can try please. I'm desperate.

100% recommend Cats Best Litter (Original) I have 2 indoor cats and there is no urine smell whatsoever. It's not the cheapest but lasts a very long time. I obviously smell when they first do a poo, but cleaned up immediately
Hope this helps

There was a recommendation here on Mumsnet Sanicat strong clumps litter. I have four cats, it's a bit dearer than most cat litters but it works very well if you remove the clumps daily as per the instructions https://www.amazon.co.uk/stores/page/A8D5ECD5-3941-413F-9281-1464BE8BCF0E?ref=cmmswrrapinasttstoreEBBD0WD4A49BBWXFFT4D

Do you have a covered litter tray? I find them and some good litter quite good for helping smells. Also maybe a small air purifier?