Potassium (like salt) decreases the freezing point of multiple liquids (water included luckily)

So the reason people salt the sidewalk when its frozen is because the freezing point is lowered when salt is applied to ice. When this happens water will freeze at around 20 degrees instead of the standard 32 making it much harder to become a solid state.

So what does this have to do with frozen pipes and potassium?

Not many people know this but as i said potassium has the same effect except in a different way because potassium creates odorless fumes that are sort of a concentrate.

That being said an old trick i have used since my grandfather told me as a kid in my 20s for frozen pipes was to find a main drain in a house (such as a shower/bathtub drain or even a kitchen sink) and mash up about 2 bananas worth of paste and feed it down the drain and promptly seal the drain with duct tape or anything to make it air tight.

Leave the seal on for about 45 minutes (the longer the better) and then flush all the toilets in your home creating a vaccum to suck the potassium gas through your pipes so its able to circulate through what little bit of pipes havent melted at this point.