Thank you for taking time to do some comparison testing between PB Blaster, which I've been using & Kroil.
I've just placed an order for Kroil on amazon.com; it's available in 3 different sray can sizes.
I also went to youtube.com & entered the search term: Kroil vs PB Blaster which came up with numerous videos all extolling the virtues of Kroil. The overwhelming FAVORABLE consensus on youtube satisfied my curiosity/question.