Inexpensive Clorox subdues many stains, but our mildewed vinyl called for some specialty products like the 10 cleaners we tested.

You may not like it, but your boat is probably filled with vinyl. Some older cruising boats have vinyl-covered seat cushions packed into every nook and cranny. After a couple of weeks — perhaps even days — of inattention, that seat cushion can become plagued with nasty mildew.

With hopes of minimizing all on board nastiness, we tested products marketed solely as marine vinyl cleaners. The field includes the usual suspects: Meguiar’s, Spray Nine, Star brite, Marykate, and 3M. We also found a product we haven’t tested before from BoatLIFE. …