Zinc on alsphalt shingles?

Does anyone offering zinc powder as a preventative measure after a roof cleaning? What have your results been?

Don’t know about zinc powder but I have pictures of zinc strips that show they don’t work.

Here’s a quick video of a roof we cleaned with zinc strips.

//youtu.be/9Egmsf4t23A

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Nice video. Were you eating chips when you recorded this video lol

Special shoes, made for gripping the shingles.

corkers?