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Old 22 November 2015, 18:51   #1
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Cleaning deposit of hull
Does anyone know how to remove stuff that looks like this?

It's a hard deposit and won't wipe off - I've tried oxalic acid, it doesn't work.

It's not a stain, just a really tough deposit.

Advice appreciated. Thanks.
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Old 22 November 2015, 19:21   #2
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Lime scale remover or brick acid ?
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Old 22 November 2015, 20:52   #3
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A decent (2500 psi) pressure washer should sort that.
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Old 22 November 2015, 21:17   #4
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yep as Wilk just said. soak it first and go for it...
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