How do you all feel about Jack's 20-20-20 fertilizer?

I had asked on another forum why my figs, zucchini and other heavy feeders don't seem to do all that well despite the fact that I regularly fertilize with Trifecta Plus, which I like but isn't very balanced. Someone pointed out that I'm massively underfeeding my plants and pointed me to Jack's and I ordered some. It came today, and I know this is stupid but the, uh, Windex Blue of it all is kinda throwing me and I don't know why. Does anyone here use it and what do you think?