I’ve tried a version of that from CarPro on Amazon and it does work. It smells terrible so use it out of sunlight in a ventilated area. If you wax your car you’ll want to apply a fresh coat to the areas you used that on.
Clay bar also works to get it off but will require a little more effort. If you don’t have a lot of that stuff I’d go that route to avoid the smell and mess.
I’ve also used mild polishing compounds before too which work to get it removed. Clay bar is my preferred choice as it can be used to remove other stuff that gets stuck on paint/clear coat.
I live in iowa and have gotten that crap on my last 3 white vehicles after the winter season. Not a fan of it at all.