Not car related, but I use Roundup Weed Killer For Lawns on my yard. NOT the regular Roundup that kills everything. The Roundup Weed Killer For Lawns kills only the weeds and not the grass. It does an amazing job. It even kills crabgrass and nut grass. Anyway, I paid $10 per quart for the concentrate that makes 8 gallons for several years. I went to Lowes to get some a few weeks ago, and it now costs $22. Wow!
That being said, it is still worth it. It really does do a great job of killing weeds. It works better than the $40 per quart stuff they sell at the nurseries.