It can be worse than what you are trying to cover up.

My landlord got one of these when a neighbor failed to take care of their cats properly and the smell began to claw its way out of their apartment. You couldn't smell the urine when you stepped into the hallway. But the strong sweet smell almost made me wish I could. It was like tossing a quilt over a messy bed.
If you need a fast, 10 minute "fix" this helps. But you need to address the underlying problem that created the smell. This won't help you do that.

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