X2Proper ventilation, not over crowded, and the right materials, it shouldn't smell. My chickens turn over my coop pine shavings enough or I help them. But my coop does not stink and I only clean it out every 4-6 months with only adding some extra coop bedding material from time to time! Smell like dirt!
If you are having to deodorize it, then something else is not working right!
Don't mask the odor, prevent it. Masking will only continue to expose your flock to unhealthy conditions.