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Volunteer as a verb


Is there a Greek verb for to volunteer as in "We're looking for anyone who wants to volunteer to clean the beach" meaning, of course, that they wouldn't get paid in any way. If there isn't a verb what would be the best way to phrase it, please?

Thank you.
The closest thing I can think of, in a verb, is "προσφέρομαι", as in "Προσφέρεται κανείς να έρθει να καθαρίσουμε την παραλία;". But the best way to say this would be to add "εθελοντικά" to that.