You do need a little patience with this one. While the effect varies, you might find that, for the first day or two, nothing much seems to have changed. However, as time goes on, all that slippery algae and stubborn mould will disappear, and the longer you leave it, the better it gets. And while it seems expensive for what it is, this one bottle of concentrate makes 30 litres of spray, so you won’t need any more for a while unless you’ve got vast, palatial gardens. It’s the most effective of the spray-and-go cleaners. Some people like to use a pressure washer to blast out moss from between paving stones, and this can be quite effective, especially on wooden garden furniture. However it is also very messy and some of the excess water could get trapped in certain areas and make the problem worse.
You could also scrub the algae, moss, etc. off by hand using a hard brush of some kind but this is quite labour intensive.

Biodegradable just means that you don't need to apply anything extra to make the solution safe once dry. How to clean your patio through the seasons? Summer: This is most likely the time you will be on the patio, so make sure to clean up any spillages or mess as they happen to minimise any long-term staining.Although the well known hot-tub brand, Lay-Z-spa, recommends clearwater for their hot tubs, I actually couldn’t find any directions on the bottle that referred to hot tubs in any way. I also didn’t test it in that way, so I can’t speak to its suitability or effectiveness in that department. For pools though, it’s a winner as far as I’m concerned. Green water blooms are usually triggered by an excessive amount of light, whether that is natural sunlight or artificial, or an excessive amount of nutrients in the water. So, keeping the right balance of light and food is a good preventative action to avoid green water, as are all the usual maintenance jobs that we’ll talk about in a different section of this article. TheUltima-Plus XP Moss, Mould & Algae Killer is cheaper than most of the other products featured in my review, yet it is certainly one of the best patio cleaners I have seen for cleaning green mould and algae. I like that it’s is biodegradable, non-caustic and therefore safe to use all around. Pets and children can be let loose onto treated areas once the floor is dry, which on a summers day would be within an hour. Patio Magic’s patio cleaner is completely biodegradable and won’t leave any residue or stains behind. This also means that once it has dried, it poses absolutely no risk to your children or family pets, and they are free to play in the sprayed area. Just make sure that it has completely dried up before though and this usually takes about 5-6 hours depending on conditions. Type of Cleaner: Smartseal Patio Clean Xtreme Concentrated is a powerful formula that can effectively remove even the toughest stains from outdoor surfaces.

Once the solution has performed the task of removing dirt and algae, give the area a good rinse with a hose or a watering can.

Sandstone Cleaning Made Easy

To get the most out of any algae, moss, or mould remover, you need to follow the manufacturer’s instructions to the letter. Failure to do so will more than likely give you less dramatic results or even stop the product working.
In general, you want to spray when the weather is bright and dry. Spray in the late afternoon as direct or strong sunlight can cause the solution to evaporate.
If it rains within a few hours of applying the solution, you will probably have to wait for the area to dry and then spray again. Drying Time: This product requires no rinsing or scrubbing, allowing you to enjoy a clean outdoor space without any fuss.