Protect summer houseplants outdoors from direct sun, wind and harsh rain by displaying on porches or under trees. When bringing plants in for the season, try giving them a soothing bath. Using a spray bottle, fill with water, add a few drops of Dawn blue dish soap and shake gently. In a bath, sink or utility tub, spray all leaves both underside and top, stems, soil and even pots. Let set for a few minutes before rinsing with tepid water. Let plants drip dry before returning to their indoor spots.