Mr Clever Clean Roof Cleaning. Your First Choice Roof Cleaning Service Provider. Roof cleaning soft wash roof cleaning service that removes by hand 95% of moss. Then Soft wash the roof with Clever Wash. The cleansing process starts immediately and the original colour of the roof tiles come back within 2 hours. The moss & lichen is killed instantly and typically takes 6 to 12 months to erode away from the roof structure, this is dependent on the weather conditions. http://bit.ly/2r2ghvY