stains on hull - oxalic not working

johnkeith

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10 Jan 2005
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Just back from giving the hull a good washdown with oxalic acid - did wonders for the waterline yellowing but hardly touched the grey deposit that built up over the summer. The boat is kept in the Gareloch in Scotland and one local told me that the marks are due to the high level of navy activity belting out diesel fumes. Whatever the cause these stains seem hard to move - any ideas?
 

VicS

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As PVB says.

If it is an oily deposit you will need a detergent based cleaner like Cif rather than an acid based one.
 

matelot

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Oxalic acid isnt a magic bullet thats the answer to any dirt problem. Try something else. I used to find my wife's liquid detergent (the stuff for the washing machine) very good.
 
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