Star san. Make a 5 gallon bucket full with distilled or ro water, keep the lid on, dip only clean items, and as long as the pH is below 3(i think?) it will retain it's magic which in my experience can be months. Also fill a spray bottle for the stuff you can't dip.It is no-rinse, biodegradable, environmentally- friendly, and correct me if I'm wrong- the residue/foam is a yeast nutrient. I brew 199 gallons a year on one 8 ounce bottle.