Sika Mould Buster 5Lt

This stuff is brillint, specially on surfaces where jet washing isn't possible or you havn't got one. just pick a day when there is no rain forcast for 24 hours, spray or brush and leave. Mould will be gone within 24 to 48 hours.

Always use this , great for keeping flags clean and even when they get a bit of mould on over the winter they come clean really easily.

This worked well in removing mould and fungi from the external walls of our house. It needed a couple of applications in some places, but a good product.

Was good for price in 2025 but price has risen so will look else were .

Algae was very well established, none of the usual cleaners would touch it. Bit the bullet and tried Sika Mould Buster. Approx 30 minutes after applying via 'garden' sprayer much of the algae had lost it's grip so I used a short-bristled (but not overly stiff) brush to shift everything that would move, repeated twice (which left a messy sworly pattern, unsurprisingly). As the caravan is in storage and I couldn't get onto the wash-stand I left it and returned when heavy rain was next forecast - a whole five weeks later (honestly - June/July '23, Basingstoke area). Over about three hours the roof was transformed. None of the materials have suffered. I'll be applying mould buster routinely henceforward (there's about 3/4 of the 5L left). NOTE, simply spraying it on and waiting for the rain to wash it off won't work, you'll need to get busy with a brush but it's well worth the effort.

So far so good we will see if the moss comes back

This is the best stuff ever

Seems to be good Easy to mix one part to 4 parts water. Lucky I have a sprayer to apply. Need to pick a dry day to apply. So far the algae seems to disappear after application