IT WORKS !, I’m very happy to say. I set it up in the bathroom shower (because of the bits of mold) and then I zapped the bathroom sink plus the toilet ????. I placed the bulb on it’s side and zapped the underneath areas of my washer. I lined up my shoes ???? and positioned them in order for the UV to affect the inside (just precaution against athletes foot because I expose my feet to public spa areas) I zapped the kitchen sink area because it kills viruses. A word of caution: anyone who uses this highly effective surface treatment should consider 2 things. 1) the area that you will treat should not be used for a short time of about 1-2 hours. 30 minutes of UV treatment and 90 minutes (minimum) allowed for ventilation. 2) After the treatment, there will be some unpleasant, sour smell (that’s normal) it’s kinda like, but not the same, as the inconvenient and offensive odor we must endure when we use any strong,effective cleaning agents. Just allow it to air out. But don’t breathe too much of it. Bacterias, germs, and viruses don’t like their guts zapped. For me, it’s well worth these issues because I hate sickness for me or my family (including dogs ???? and cats ????. The timer that comes with it is extremely helpful. BTW temporarily, keep them out of the treatment area also. The product is very well made and very effective.