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If you own a home on the Sunshine Coast, you have probably noticed dark, crusty patches creeping across roofs in suburbs from Maroochydore to Buderim to Caloundra. Those blemishes are very often black lichen, and Colorbond roofs are not immune. The coast's warm temperatures, high humidity, coastal air and regular summer rainfall create ideal conditions for lichen, moss and algae. This guide explains what black lichen is, why it grows on steel roofing, how to remove it safel