I fabbed mine up 3 years ago. Live in Michigan. I have pulled mine off a few times to check. No issues with “air flow” looks like the day I got it. From 3 years of driving in all season types of driving it’s worth it. With the OP design, appears a quick install and removal if needed to check and clean. Plus the appearance is a plus. Glad yours has stayed clean.You'd have to be damn near a fool to print and install this. It would obstruct air flow to dry out the rocker. Just rinse it out when you wash the vehicle. It really is as simple as that. 3 winters and there wasn't that much debris in there, so OP is exaggerating. And no OP, you don't need to remove anything to flush this area.