Moss and algae can be a real pain to remove from patios, but there's a simple method to get rid of them for good11:19, 30 Aug 2026Updated 11:21, 30 Aug 2026A dirty patio can quickly become covered in a mix of algae, moss, lichen, fallen leaves, soil, stains and everyday grime. That tell-tale green coating is particularly common in damp, shaded areas, where algae can thrive in moist conditions with little air circulation.‌While moss and algae may not necessarily damage your paving, they can create a serious slip hazard. Patios, garden paths and steps can become particularly slippery after rain, which is why the Royal Horticultural Society (RHS) recommends keeping the growth under control on surfaces that are regularly walked on.‌Why patios get so dirtyCommon causes include:‌Rain and damp weather – particularly relevant in Wales and across the UK.Shade from walls, fences, trees and buildings.Poor drainage or water sitting on the paving.Fallen leaves and organic matter, which provide material for growth.Dirty joints, where moss and weeds can establish.North-facing patios, which generally receive less direct sunlight.However, the experts at Infinite Paving have revealed there's actually a surprisingly simple way to get rid of both moss and algae and stop them from coming back — and all you need is a bit of baking soda.They explained: "One very unconventional yet very effective way of getting rid of unwanted paving weeds is by using bicarbonate of soda.‌"When eradicating moss from your garden, bicarbonate of soda, or baking soda, is a very powerful substance that will get rid of the moss in no time."Baking soda may seem like a basic household staple, but people often underestimate just how useful it is for tackling grime in various areas around the home — and it's equally effective at destroying both moss and algae.‌Moss and algae can only survive in an acidic environment, whereas baking soda is an alkaline product, meaning it raises the pH level on a surface and prevents them from being able to take hold.Baking soda is also a natural absorbent that draws moisture from a patio, effectively dehydrating moss and algae and making it far harder for them to survive.It's one of the most straightforward ways to tackle moss and algae, while keeping your patio dry and less acidic, reducing the chances of regrowth for the rest of the summer.‌How to remove moss and algae stuck to a patioAll you need to do is wait for a dry, sunny day, then give your patio a good sweep to help loosen any stains first.Next, liberally sprinkle dry baking soda on any areas of your patio plagued by moss or algae.‌Leave the baking soda to sit undisturbed, giving it sufficient time to dry out the affected areas and raise the pH level. This process typically takes between 24 to 48 hours.If you like, you can continue to apply baking soda during this period.You'll know the treatment has worked when the moss or algae begins to turn brown, which is a clear sign it's dying off.Article continues belowOnce it has completely dried out, the moss or algae should be simple to clear away with a quick sweep of a broom. Rinse your patio down with hot water, and it should stay clean and free from unsightly stains for a considerably longer stretch of time.