"I bought the Amcor 2000 Ionizer & Air Purifier because everyone gave it such great reviews. I used it in my bedroom about 4 feet away from all of my expensive mahogany bedroom furniture. The directions tell you not to have it near TVs, radios, VCRs, metal surfaces, furniture in general (go figure). But then in the next sentence, it states that you can put it on your night stand. (Don't most nightstands have clock radios on them?) Anyway, the purifier left a horrible white residue on my bedroom furniture and on the walls that the purifier was facing. It does say in the book to clean around the "area" once a week, because such a residue will accure, but it was like nothing I have ever seen before. So now I have to scrub my furniture and walls down, lucky me. Also, I do NOT smoke, nor do I have pets. I just wanted "extra" fresh, clean air in my bedroom. So much for that idea."