In my cases, the odor helped after getting themfixed. Generally speaking it does, and it curtails their need to sprayand territorialize everything. There are no guarantees.
You might want to check on the scent glands and make sure the rabbitsare clean. A lukewarm sponge bath on their butts can help. You have tobe very gentle and careful when cleaning them. It's not recommended todowse a rabbit in a bath as it can shock and/or cause a heart attack.
The search box at the top of the forum have a lot of posts aboutquestions for spaying/neutering, smelly poop, dirty bums, etc.
Don't know what litter you're using. I use WoodyPet for now, but I'mabout to try something cheaper. WoodyPet in a 40 lb. bag costs about $6or $7 in my area. It is effective in soaking up the urine smell.
-Carolyn