The product has a “unique combination of biodegradable selective surfactants for moss, mould, lichen and algae removal on any exterior surface”, according to its website.
The cleaning solution has to be diluted with water and applied to get rid of such contaminants.
Another recommendation from Mrs Hinch fans was a product called Patio Magic.
A user said: “Patio Magic is very good. Morrisons Have it on offer sometimes.”