100% right on the pink junk being Stabil. It’s no help for Ethanol. This is a discussion I have with customers all the time when I test their “100%” gasoline and show them 4-8% ethanol in it. I always recommend the best non-ethanol you can find PLUS an ethanol treatment. Ethanol-shield* and Startron* have both worked ok.
ON my carburettor stuff that sits i generally drain the tank then run 'em 'til they stop. Next give a squirt or two of Marvel Oil from a pump can into the fuel line and crank it over as bit--fresh fuel when 'tis the season and they just pop right off...
Pink stuff in the bowl? That sounds like out of Date StaBil. I've cleaned more carbs for people who've used Stabil than any other treatment. I started using StarTron. Haven't had 1problem with my own equip.