The moment I stepped onto my boat, a strong musty odour hit me. It was a hot summer afternoon, and the sun had been beating down on the seats all day. I thought airing it out would help, but the smell only seemed to get worse. I ran my hand over the vinyl, dry but something wasn’t right. Could it be mildew? Trapped moisture? Maybe leftover sunscreen and sweat baking in the heat? I tried wiping the seats down, but the odour lingered. Frustrated, I knew I had to figure this out before my next trip. What’s causing this smell?