The Carboy Cleaner makes cleaning carboys, including PET carboys, fast and simple. Attach the cleaner to a cordless drill (1,000 rpm or higher), insert into your carboy, move up and down and let the Carboy Cleaner do the rest! This carboy cleaner is constructed of a stainless steel rod with two super absorbent, lint free, soft cleaning pads to wipe carboy walls clean without scratching them. High-strength, yet flexible plastic inserts inside the pads help keep the pads rigid during use. The expanding sponge at the end of the cleaning pad assists in the centrifugal cleaning force for tough to get debris.