Vinyl Top
On my cars I use a product called Protectent 303.
Works like a champ and does not have any of the chemicals as the others and use very little of it and it makes my 35 year old top on the Mr.Norm's car look like new.
Most of your boat stores will have it think I saw it in NAPA to and I will let you know its alittle pricey at $12 a bottle but you get what you pay for.
Thanks,