I did my bonnet with red and i don't have problem cleaning them. Haven't wash my car for 3 months now and the bonnet part is still very clean,no dirt stain at all. I use water only to clean a bird poop last week without using any cleaning foam or shampoo. Only thing that need to worry about is the oil stain from mechanic hands when you send for car service. Other than that i don't think there is a problem :)
I can sell you PD glossifier but it won't be cheap as ACE price,PD malaysia quote me RM75 for a can of spray glossifier