What I recommend doing and this will help in odour reduction... have your boys neutered, your girls spayed and have them all living together as a colony in a huge cage in the main living area of the home. Having rats in an enclosed bedroom will smell no matter what, it would be the same if you enclosed a cat and its litter box in a bedroom. But out in the open, a family room, living room, dining room, the smell is not concentrated.
What type of cage are they in now? Rats require lots of space and hamster cages are definitely not enough. Also a good quality rat block like Oxbow Regal rat will help with the odour. Use a bedding like Yesterday's news, it's absorbent and controls odour very well.
If you can't afford both spays and neuters, I highly recommend spays since it's so beneficial to the females health wise.
And... CONGRATS! on the new additions!
Also, I don't know how to post pics. here. They both have 2 story cages.
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