The corn meal needs to be applied before the maple seeds germinate. It may get any slow starters but the rest will need to be removed manually. And yes, that should take care of the issue, at least for this season.

FWIW, our native big leaf maples are prodigious seed producers and this procedure is an annual occurrence around here. There are literally thousands of baby maple seedlings under any larger tree (or within the prevailing wind flow) every spring.

Now is a good time to clean out your gutters of maple seeds.
Mike

Thanks! It has always been an annual thing with the maple seedlings, but this year there has been an exponential explosion! Gutter cleaning is a great idea, now that you mention it. :)