cleaning grubby old fibreglass hull - advice pls

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scotty123

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Mate has a small boat hauled out in local boatyard, with intention of getting hull/deck cleaned/polished (expensive, but time poor). The yard guy abandoned the job after a test clean & said it was unviable, due to the deep staining, with painting being an option (fair advice).

My mate has cleaned some of the hull with 'jif' & then pressure washed to get rid of deeper imbedded grubbiness. However, this is taking an age + some brown stains (could be rust) unable to move.

Is there a recommended cleaner, which would help?
have seen use of oxalic acid + oxalic acid based cleaners, but the bottom has a copperbot antifouling, which any acid might attack.

What straightforward paint job is suggested, should the deep clean fail?
How much for a 22' hull, approx?
 
Yup, put the oxalic acid in a paste to hold it in place for a while.

SR had some serious hull damage & it was too cold for painting over winter so I took a few sheets of wet & dry to the worst bits, (which were actually crazed or pitted paintwork) T-cut to the better bits & then polished her. Terrible close up, but from a typical passing distance she definitely looks white as opposed to the grey & smudged she looked before. She'll do another season.
 
Time poor and old boat is a bad combination ....

Second use of oxalic acid plus a little wallpaper paste to hold it in place on the white hull for half an hour on a warm day. Then wash off.
 
brush neat Harpic on (harpic extra strong in Black container) on to hull, no scrubbing just apply, leave for 30 mins and wash off with hose and brush. Oxalic as described for black streaks
 
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