Windshield cowl drain block ideas?

The place where I park my car is under a large maple tree and there is constant leaves falling, and even though I check every few days I am concerned about them entering and blocking the drainage at the base of the windhshield wiper arms. I try and get them out by blowing and vacuum but some leaves dissapear to an area that I can’t get to.

Any suggestions how to install some kind of device that would prevent the leaves blocking the drain?
 

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