Spots on the anti slip decking that refuse to budge

[paradave]

I’ve tried y10, soap, various polish and have brushed Like mad but can’t seem t shift them. I’ve not idea what they are….any suggestions would be very welcome. Thanks

 

[IDAMAY]

Try Cillit Bang Black Mould Remover. It worked on our non slip and didn`t need massive effort. Best of luck.

 

[Bran]

Another vote for Cillit Bang, spray it on, quick scrub, leave 10 minutes then rinse. Nothing I have used comes close.

 

[timbad]

+2 for Cilit bang
In the past I have also tried Aldi/ Lidl equivalent worked OK.

 

[MoodySabre]

That looks like moulded non-slip so a pressure washer up close usually does the job.

 

[Scubadoo]

Same as Moodysabre, pressure washer works every time for me on non-slip areas.

 

[paradave]

Thanks all - I’ll try the cillet bang first as it’s easier before breaking out the karcher.
much appreciated.

 

[Megs20Burt!]

when (if) you take the boat out of the water and it will be ashore for at least 2 weeks, apply wet & forget. Make sure it doesn’t rain for at least 4/6 hrs after application.

We had the same issue with our swim platform, 4 months later totally clean, no mould or algae growth. It is dangerous for aquatic life when first active, hence apply when out of the water.

it remains active for up to a year.

 

[Scapegoat]

Starbrite Mildew Stain Remover works well

 

[paradave]

A massive thank you to all the Cillit Bang posters.

I sprayed it on yesterday, went for wonderful tapas and when I came back, it was all still there but slightly lighter in colour. I turned the those on it and they just fell off leaving the decking looking brand new. Veyr impressed and grateful, didn't even require elbow grease!

 

[ChromeDome]

Pressure washer with rotary nozzle does it.

 

[LittleSister]

This thread is a revelation!

I have identical looking marks to the OP but, in part because they were more on one side of the boat than the other, I had assumed ever since I bought the boat they were overspray from someone painting a nearby boat, and resigned myself to their permanent presence unless I painted all the non-slip moulded areas.

I shall attack with one of the recommended potions at the next available opportunity!

 

[oldgit]

Neat Patio Magic shifts anything . Leave to dry and let the rain do the rest ,Why would you even bother any other route ?

 

[paradave]

This thread is a revelation!

I have identical looking marks to the OP but, in part because they were more on one side of the boat than the other, I had assumed ever since I bought the boat they were overspray from someone painting a nearby boat, and resigned myself to their permanent presence unless I painted all the non-slip moulded areas.

I shall attack with one of the recommended potions at the next available opportunity!

Mine were all just on one side too weirdly. Must be something to do with where it was kept before and sunlight etc. Hope it works as well for you.