have any 2IS owners had this problem with the top of the trunk lid?

i noticed that rainwater pools up on the top of the trunk lid quite heavily. in a recent wash i noticed that our 4 month old 2IS now has some sort of staining on the top of the trunk lid from something in the rainwater that dried up. i got most of it off with a claybar but there is still some there. you can't feel it but you can definitely see it.

thinking of getting a clear bra on the trunk to prevent it in the future

Zach