$4.97 is cheaper than average and close to lowest in past 6 months as per 3x camel.
This is NOT the typical rainx treatment that most people get. This is to add to water in warm months or cheaper winter washer fluid in freezing Temps. At least that's how I use it. Works nearly as well for me with little effort.
Let me know if I made even the slightest mistake and of course roast me alive for it, in true SD fashion.