Was milk and 7 up really a thing?

I've come across this old advert that suggests pouring 7 up into milk to get kids to drink more milk. I've never heard of it or done it but what about you?
Was milk and 7 up really a thing?
I've done it
I haven't done it
I'm going to do it
Sounds revolting.
Select gender and age to cast your vote:
Was milk and 7 up really a thing?
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