How to get rid of deck algae?

[teensailer]

I have been trying to clean the decks of my joint-owned Swift 18 but there are loads of dark green/black spots all over it. So far the only thing which has worked for getting it out from in between the anti slip is a metal scourer, Even that doesn’t work completely and is not going to manage for the whole deck and cockpit.

So I wondered what other people use for this kind of problem?

Thanks

 

[Seastoke]

Patio majic

 

[Dellquay13]

Patio majic

As long as the boat is ashore, the run off isn’t good at all for aquatic life. Even after it has been used in dry weather and left to dry as directed, it still poses a risk to waterways when it gets wet again.
It does work though.

 

[toothless]

jet wash will get rid in a very satisfying fashion. itll also uncover lots of leaks you didn't know you had. don't point it at obvious weak points.
patio magic will kill it all but wont clean the deck.
i tend to do the (gentle) jet wash route then give it a bit of patio magic after. seems to do the job.

 

[johnalison]

As long as the boat is ashore, the run off isn’t good at all for aquatic life.

I have used it on teak and taken care not to apply excess. In any case, it is better to paint it on, eg with a deck brush, rather than spray it.

Paint it on at the indicated strength, say 1:5 when there is no risk of rain. You may not see much change for a few days until the green or black washes off at the next rain. It seems to be safe to use on fabrics such as boat canvas.