Since I live in Canada I can't source the Seventh Generation of the TSP/90 and the OxiClean is about 50% more expensive so making this fomula is challenging.
Fortunately for me, I live close enough to the border and I was at the end of my supply of PBW, I used this an an excuse to cross and pick up a few things and here is what I was able to put together:
OxiClean Versatile Free, 2X52oz tubs at Target - $15.28
Seventh Generation 75oz box at Target - $6.49
Red Devil TSP/90, 64oz Ace Hardware - $11.99 (I got the last 4# bag and they told me that is was being discontinued)
This works out to $2.22/lb USD or about $2.75 after the exchange. More than worth the drive.
As for how well it works, I did a big cleaning today and my kegs look spotless, my BIAB bag looks like I just bought it and I hope my CFC is clean as a whistle after circulating for half an hour.
I did notice that as others have noted, if the water is cool to cold, it will foam quite a lot. I heated water in my kettle to about 180 and added 1oz per gallon. It dissolved very nicely with only a gentle stir. I fired up the pump to recirculate through the CFC and no foam at all. I then transferred some of the hot solution into my kegs and a cleaning bucket for all of the various parts and pieces. There was a film of the cleaner left on the walls of the kettle and when I used some cold water to rinse the walls, it foamed quite heavily. I then decided to take the rest of the stuff inside where I could rinse with hot water and there was very little foam.
One last thing, where I live, the water is quite hard (+250 mg/L) and there doesn't appear to be any film or residue on anything that I cleaned today after a good rinse.
I spent a lot of time going back and forth in this thread to get a handle on everything so I hope this post helps out with anyone looking here for the first time.
Cheers
PS One thing I noticed in looking around is that the All Oxy Laundry Booster is now showing at almost $16 for the 52oz tub at Walmart and on Amazon