I use on/ off , it's pretty easy to use, but you must keep your trailer wet (it will eat in to some trailer parts. I have never heard of the stain coming back "sooner" if you use it? After all it's made for bottom cleaning, it' strong, but lots of people use it often.
I have seen waxed areas not stain "as bad" - I know because sometimes I can see where I stopped waxing the bow area water line.

I'll have to try that. I know the Chesapeake water has a lot of tannin in it. Tannin is also found in red wine, that's why it can stain your teeth, carpet, or anything else.

We used to do it with a garden sprayer, now I dump it in a bucket and apply it with a soft bristle brush, its faster and uses less product.

I have also cut On/Off with water and used it occasionally. I found waxing the entire bottom meant I could go for 5-6 weekends without the bottom turning color. If I dunk the boat in the water after On/Off before waxing it would stain up that very day.....Guess that stuff cleans so well it leaves the pores open to faster staining (that's my theory anyway). Since I trailer and only leave the boat in when overnighting I could wax the bottom when I did the entire boat before spring launch, then again when I waxed the entire boat for JOTJ every July.

Attwood hull cleaner works great, not as harsh as on/off.
http://www.walmart.com/ip/Attwood-32...ottle/16351032