“We have a patio made of Indian sandstone slabs which looked fantastic when first laid, but got really dirty and green in places quite quickly,” they said.

Last month Service Director Nino Piccoli expressed a need to replace sandstone slabs in Medina’s historic district with concrete as these areas have created a tripping hazard in recent years. At ...

One brit said: “We have a patio made of Indian sandstone slabs which looked fantastic when first laid, but got really dirty and green in places quite quickly,” they said.

GREEN algae loves patios: it thrives in the damp, shaded areas and feeds on leaves, dirt and pollen. The slime is an eyesore and can even lead to long-term staining or discoloration of your beloved… ...