Here is what I did to keep the rat smell to a minimum in the bedroom.

1. Use aspen and any wood shavings only for nursing mothers. Aspen and Pine still stink when peed on. It almost negates the purpose of the pellets.

2. Get an automatic sprayer, set it up in the corner of your room. Avoid sickly sweet scents like Vanilla or Orange, try spiced apple, fresh breeze, soft yet clean scents like fresh clean laundry....

3. Have an exhaust window fan on 24/7. Closer to the rats, the better.

4. Vacuum the bejeezus out of your bedroom weekly. Do it after you have changed the rat tubs. Vacuum the dust off any furniture, and around the tubs themselves. Best if you use a Dyson ()

That's what I did, and guess what?! It hardly smelled at all. Even Chris' mother didn't notice, and she was our biggest critic.