Star brite 89950 M2DG Slow Release Mildew Odor Control Bags, 10 Grams, 2/Pk

The ideal way to prevent foul smells from forming in boats or RVs during winter layup. Its controlled release allows it to remain effective for up to 3 months, keeping enclosed areas odor-free. Placed where air can circulate freely around it. Not for use while people and pets are present.