Ten out of 19 of the best-selling household floor cleaners made floors more slippery than they were before cleaning, according to a study by the National Floor Safety Institute (NFSI), Southlake, TX.“Over half of the products left a slippery residue after only one application,” insisted Russell Kendzior, founder and executive director of NFSI. “Most of the products tested contained a strong fragrance; it was like putting perfume on the floor. Although they made the room smell g...