How do you use lemon juice to exfoliate under your arms?

I was just wondering what you do with the lemon juice...whether you just rub it or what?How do you use lemon juice to exfoliate under your arms?
its best to use a real lemon (the rind and just scrub) or apply the juice to a cotton pad and apply to armpits..just don't do it right after you shave...it might hurt....alot!How do you use lemon juice to exfoliate under your arms?
cut a lemon in half and rub it under your arms........

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