I recently used BLC on all my taps, 14 on the walk-in, and then also on two jockey boxes, a 6 pass, and a 2 pass. I use my chugger pump with adapters to connect it up and recirculate the BLC for 15-20 minutes per setup.
On the jockey boxes, I could only do one line at a time due to restriction from the tubing and cold plate lines. On the walk-in, I started with just doing a simple loop with two lines at a time, but once I got to the lines that I was using John Guest fittings on, I used Tees to do 4 at a time, which worked great.
In doing research, I just bought Penetrate, made by the same company that makes BLC, and it appears to be a more concentrated BLC. The primary ingredient is still potassium hydroxide, but double the concentration, as the recommended doses are half of what was written for BLC. I wanted to get their DAC since it also has a stronger caustic, sodium hydroxide, but I couldn't find it at a place that had reasonable costs including shipping.
I don't expect to use Penetrate any time soon, but I expect it to work as BLC, just needing less, or using a higher concentration for a stronger cleaning.