Boat cleaning wash it after every time with use washing up liquid http://www.uk.pg.com/products/products/fairyLiquid.html
It will stay looking great. If you need to do a bit of toob renovation paint thinners or traffic film remover (truckwash in your speak )http://www.eurochem.co.uk/products.php?categories_id=11
use it and wash off almost instantly washing up liquid works for GRP too
Stainless claen with some stainless stuff or olive oil. http://www.oliveoilclubs.com/ http://www.screwfix.com/prods/84414/...teel%20Cleaner
Keeo your fuel meticulously filtered. If your boat doesn't have a water separator on the transom then fit one, even if you are using removable tanks. http://www.maesco.com/products/racor/racor.html
remember yuor passengers aint got as much to hang on to as you do and always let em know when sudden moves are a'coming Also remeber that kids are custom built to smash there little faces into the adult sized grab handles It's a bad feeling when it happens, for you as well as the nipper so I'd advise wrapping some pipe insulation/ BMX tube foam if yore carrying kids
Spend time with your trailer learn to love your bearings before they make you hate them, also look at your winch strap regularly change it if it looks iffy.
Think about new batteries (if not already) and ensure your main 12 volt feeds are lovely and clean and vaselined make sure you have no corrosion in the cables.
flush your engine either with muffs or in a cold water storage tank
never bought a bad product from this company BTW 3m boatcare
Just having a bit of un with the links but washing up liquid and olive oil do a good job. if yopu have to spend some more money then try this lot http://solutions.3m.com/wps/portal/3...Info/BoatCare/
I'm sure you'll get loads more advise soon. Happy boating by the way