I just moved into a new apartment and noticed that when I turn the fan up high on the in-wall heating/ac unit there is a strong smell of urine. I swear that someone peed in it. Is there some way to open the thing up and look? The one that I have looks like this.
If there truly is urine or dried up remains of urine in the heater one way to clean it up is to douse and wipe it up with a product such as "Nature's Miracle" which neutralizes the odor causing organics in urine and its by-products.