Five Star Chemicals has been producing cleansers for commercial breweries for some time, and has now packaged their cleaning technology into home brewing sized packages. Their approach is twofold; the brewer first uses Powdered Brewery Cleaner to remove deposits from equipment, and then uses Star San, a professional grade soaking sanitizer, to sanitize the cleaned equipment. Both PBW and Star San are safe for limited contact use with stainless steel, plastic, copper, brass, and ceramics, and are safe for septic systems.
This one pound jar of PBW will make 12 gallons of dilute scrubbing cleanser (should be used in combination with Star San, a non-rinsing Sanitizer).
Jun 01, 2019 by Steve Ruch
Q: Does PBW work in cold water?
A: Yes, but the warmer the water, the more effective it is.

PBW
Works just like it is supposed to.
PBW
A must have for running a post brew cleaning loop
Only cleaner I use
PBW is the best cleanser I've used to date...It gets off even the worst sticky burnt messes like scorched wort and it works for everything in my set-up, not just bottles. Hoses, pots, pumps, spoons & paddle, MT, RIM tubing inside and out, At the end of every brew session, I save about 1/4 of the hot / warm water in my HLT to mix with some PBW. Then use it to cycle through my pumps, hoses, SS tubing, ect. I don't so much rely on it's "sanitizing" properties though. I leave that up to the Star San. Highly recommend as a cleanser. I even ordered one of the small packets of PBW to give to a friend of mine so he could see how great the stuff is. ( Well, I wasn't going to give him MY PBW, LoL ) Williams shipping was fast and courteous as always. J.Anderson
works great
Makes cleaning carboys and kegs simple. Just soak for a few hours and all the gunk comes right off. very little to no scrubbing involved. I highly recommend this product.
Tried and True
Why bother with anything else! Once I started using PBW, I haev never had sanitation problems with my beer. The only way to go!