The product range which I have experience of is Renovo which is available in the US - it is also marketed as a boat product available from chandlers, but is the same stuff in the bottle.
Full instructions are on the bottle, but basically you need to use the Soft Top Canvas Cleaner (500ml), Reviver (1 litre to be on the safe side but you may get away with 500ml) then weatherproof it with the Ultraproofer (500ml will do 2 coats).
It really is easy and will make the colour even, deeper and look like a new hood.
They also do a plastic rear screen cleaner but the best product for this is Hindsight, available from Hindsight in Scotland. I'm sure they will ship to the US.