Mud stain on Hull

[Kintail]

Hi folks. I have my first boat a Hurley 22 and I am taking out of the water soon to antifoul etc. She has been moored in a drying mud harbour and above the waterline the white hull is browned. How do I get rid of the brown...does it polish off, for example?

 

[VicS]

Hi folks. I have my first boat a Hurley 22 and I am taking out of the water soon to antifoul etc. She has been moored in a drying mud harbour and above the waterline the white hull is browned. How do I get rid of the brown...does it polish off, for example?

Y10 or make your own substitute by thickening an oxalic acid solution with wallpaper paste.

http://www.mailspeedmarine.com/boat-cleaner-polish/y10/stain-remover216273.bhtml

Worth giving Cillit Bang Grime and Lime a try if you have any

 

[karl74]

I use Starbrite instant hull cleaner and then give it a good polish. Before that I've tried all kinds of stuff including bleach, cillit bang and t-cut to name a few with no effect.

 

[essexboy]

Brick cleaner, brush on, 10mins wash off, cheap as chips, safety precautions cloves, eyes !

 

[ProDave]

Aldi caravan cleaner. Much cheaper.

 

[jellylegs]

google Ensearch - fabulous stuff, and results.

 

[Crabber24]

+1 for Cillit Bang Grime and Lime.

 

[VicS]

+1 for Cillit Bang Grime and Lime.

I think almost anything acid based will probably work.

Grime and Lime, oxalic acid, brick cleaner, lavvy cleaner.

I suspect the brown stain is organic matter absorbed into a carbonate deposit. Dissolve the carbonate and the stain is gone.