They already have wintergreen soda, its called rootbeer.
Sponges: no mint soda would not be good. Remember those concentrated "sweet drops" that were sold as a breath freshener on a tiny eye dropper bottle, that were discontinued in most regions because they were a disruption during school because middle school kids were drinking whole bottles and using its alcohol content to light their hands on fire during class?
Well put a couple drops of that in a two liter bottle of cola and it tastes gross. Like I should really not experiment with things that warn you not use them in ways not in accordance with their recommended purpose gross.
Ná gearradh an adhmaid. Amháin a thuiscint go bhfuil an t-adhmad gearrtha cheana féin.