Rubber protectant that doesn't bead water? Do it exist

Is there anything out there that I can use on rubber that will not cause water to bead, and just cause it to run off instead? Reason why I am asking is becuase it seems the rubber trim seal on the front window will turn a brownish yellow where the water spot has sat for extended periods of time. Why it is doing this, I have no clue. I figure a way to prevent it is to cause water not to bead on the seal at all. Any ideas?
 
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