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Probably "artillery fungus" a fungus that thrives in wet/humid conditions. Also attaches to sails, etc. The fungus penetrates into the 'pores' of the gelcoat and thats why you have a hard time 'cleaning' it off.

Best way to get rid of it is DISSOLVE the cells by usage of a strong caustic detergent. Sodium Silicate based detergents work best, followed by trisodiumphosphate (TSP), etc. Such wont harm the gelcoat but will totally strip out any wax that you applied; the boat will need to be rewaxed after a 'soak' of strong caustic detergents.

Apply the strong detergent, let it soak; you may need to apply then cover with some thin plastic sheeting as it may take some 'soak time' for the caustic to dissolve all the fungal filaments that have penetrated into the gelcoat.

Any shadows or discoloration remaining after the soak .... get some oxalic acid (wood bleach) from a paint store. Put the crystals in a bucket and add 'just enough' water to dissolve 'most' of the crystals and apply the mix to the staining. Dont mix caustic with oxalic .... rinse thoroughly between the caustic and oxalic applications.

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Rotamolded ..... then the black specs are essentially permanent !!!!

This a generic and widespread problem with rotamolded polyethylene that is very common when funguses, etc. penetrate very deeply into the polyethylene ... and cant be removed because they are now deeply penetrated INTO the plastic. Polyethylene is very resistant to most all inorganic chemicals and most organic chemicals so the risk of turning your component into a ball of molten plastic is very low.

Especially white and yellow rotomolded Kayaks, etc. especially those that are stored 'outdoors' are prone to this. Since your console is rotamolded, I would advise to contact the manufacturer for their advice and possible replacement, etc. --- sorry.
 
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