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Not to get rid of the green stuff necessarily but to prevent it taking hold through the year. I have used it after washing and waxing the roof which is basically how it is meant to be used and it works well in terms of keeping the green stuff away. I know others who use it on vans and boats without any issues so not sure about other comments regarding it being unsuitable . . .Hi has anyone used this on the roof to get rid of the green stuff or would you not recommend .