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Green Algae growth on outdoor surfaces is a problem for homeowners throughout the UK. Find out here all you need to know about green algae, why you have it on your patio, how to remove it, and how to prevent it returning
If your patio has developed black marks which you are struggling to remove, the probability is that your patio is suffering from Black Spot.
If you have these tell-tale marks on your paving, you’ve got black spot
See it here on a recent customer’s sandstone patio:
And here on a granite patio last year:
Read this blog to understand what Black Spot is , and the best way to remove it: