Remember not everything that glows is a disgusting bodily fluid. In fact most bodily fluids hardly glow at all, urine itself only glows the faintest of orange-brown. If our fluids and what not glowed than it would be easy to assume that just by pointing the lights at ourselves we'd light up like a Christmas tree. CSI the show has made us think a black light can reveal all when it's really an entire process using special developers and chemicals to bring out organic stains. The best you could hope for is that the bright spots you see are detergent spots since they contain phosphor brighteners to make those whites whiter and colors more colorful.