How to Clean Salt Stains on Gelcoat

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I took the SeaDoo in to get detailed/winterized, and to have them clean the salt deposits off of the hull (we use it mostly in salt water). They did everything, except clean the salt deposits on the hull. Said they didn't have the right products and were worried about damaging the gelcoat. Has anyone experienced this? More so, how do I clean the hull? I rinsed it with salt away and scrubbed with microfiber, but there are still a bunch of salt deposits.
What year is your machine? If it is gelcoat I would go at it with a polish or a mild cutting agent like the Meguires 49 and then the polish or the Meguires One Step? Never used the one step but it might be aggressive enough to take the salt stains off