Homeowners are unaware what is growing/staining their Slate & Tile roof. What is it you ask? they are algae, mildew, lichen and mold. with our non-pressure roof cleaning process. we can remove all these infestations. What is our process to Clean a Slate or Tile Roof? Hometown Roof Cleaning does not use a pressure washer also our cleaning solution is non-harmful, safe for family, pets and your landscaping. You will be astonished when you see the renewed original colors of your slate roof.