Eryka's suggestions on clorox or white vinegar are good, lysol also works fairly well to help prevent mildew from returning.
However, the real thing that is necessary is ventilation and preventing water intrusion. Without proper ventilation, nothing will prevent mold/mildew from recurring. If the boat is tight and well-ventilated, there is little chance for the mildew to take hold. If you have leaking deck fittings, chainplates, weeping throughhulls, and no ventilation, then there is no chance of preventing mold and mildew. Even if the boat is 100% watertight, as mine is, ventilation is still key. The heating and cooling of the boat caused moisture to settle out inside the boat unless the air is circulating. Hot air, when the boat is heated during the day, holds a lot of moisture, and then as it cools, a lot of the moisture will settle out into the boat, unless the air is moving and replaced with cooler air.
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You know what the first rule of sailing is? ...Love. You can learn all the math in the 'verse, but you take
a boat to the sea you don't love, she'll shake you off just as sure as the turning of the worlds. Love keeps
her going when she oughta fall down, tells you she's hurting 'fore she keens. Makes her a home.
—Cpt. Mal Reynolds, Serenity (edited)
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Still—DON'T READ THAT POST AGAIN.