Lilly Miller 05601049 Moss Out is a safe solution for removing moss from decks, patios, sidewalks, walkways and rooftops. Moss Out extends the life of your roof for months, even years. It prevents the costly damage associated with moss and improves the aesthetic nature of your roof and outdoor surfaces. Instead of power washing or using bleach, which damage shingles, use Moss Out for safe, stain-free moss removal. Apply generously; application lasts up to a year.