Advice/ideas

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So this may be a weird question but I’ll ask anyway 🤦🏻‍♀️😂 Can someone help me on trying to teach my 4 yr old how to blow his nose... I’ve tried all the ways I can think of and he just doesn’t understand to blow out of his nose to get rid of booger’s. He will sneeze, boogers come out then he just sucks them back in 🤷🏻‍♀️and eventually he ends up congested from sucking back all his booger’s... so any ideas or advice would be very much appreciated