Quote:
Originally Posted by Kolyan2k
It's for drainage. Concrete can absorb water/snow. And it's for ventilation to prevent mold. Mine looks clean and new even after winter and all dirt. Just vacuumed and power washed it. Some crap gets stuck there but it's impossible to see
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agree! that's why they are called free flow design. i just vacuum and than pressure wash once or twice a year...easy peasy!
