Someone with a lot of spare time did a comparison test and sent the results to Machinist's Workbench magazine. From worst to best WD-40, PB Blaster, Liquid Wrench, Kano Kroil. Liquid Wrench was "almost" as good as Kroil at 20% of the cost.
Surprising news, a home made concoction of equal parts ATF and acetone was the best by far. It broke a "scientifically" rusted connection with 1/2 the torque required by Kroil, and 10% of the torque required without any oil.
As with anything found on the internet, consider carefully.
Gus