I have a 748s in the better satin grey colour and use an acrylic bike polish (forget the brand name) to protect the paint.
As its satin/matt it won't go glossy not supposed to I just polish for protection from the sun/dirt etc.
The problem is as soon as it is left in the sun the white streaks show up all over it as if the polish has been burnt by the sun it is in the sun for about 4 each day at work.
Not sure if it's worth trying mate, but I like that aerosol spray polish by Autoglym. Haven't managed to leave any streaks myself since trying it but I guess your bikes finish may present its own problems.
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