Keep your hull in tip top condition and share your ideas here!
One of my biggest pet peaves... brown water stains on white hulls.
On & Off takes that stuff off, makes a stained hull look new, and right now is on sle at West Marine for under $10. If your hull is stained, run out and buy a quart today. Brush it on, hose it off, admire your clean, bright hull again! It'll make me happy too.
Try to keep it off your galvanized trailer though, it'll brighten it too, but not as pretty. It's an acid concoction, so use caution.