I hear you guys but I would prefer to use a product with years of proven results. There are plenty of cleaners that work great but aren't safe to use on the marine vinyl uv topcoat. I cant confirm that malco is even safe but at least it's been proven in the industry. Simple green cleans great, so do magic erasers. But they remove that topcoat and your seats will dry out and crack no matter how much 303 you slather on. That's why vinyl mfgs hate bathroom cleaners. They work great but greatly reduce the life of the vinyl.