Does white spots or vhs mold can risk to your vcr and other vhs collection? or will a vcr headcleaner fix it and dont worry?

A few thrifty vhs movies have white mold aling the taoe edge, others with deep mold I threw out, is there a way to kill it, or reoair too? or just play it and dont worry, or will it spread to other tapes?
-thanks
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