Clean Bottle Express Carboy Cleaning Brush The Clean Bottle Express carboy cleaning brush helps scrub residue from glass and plastic carboys, fermenters, and narrow-neck vessels that are difficult to clean by hand. Use it after fermentation to loosen krausen rings, yeast residue, fruit deposits, and other buildup before sanitizing. A dedicated cleaning brush is especially helpful for brewers, winemakers, cider makers, and mead makers who reuse fermenters often. Useful For Cleaning carboys and narrow-neck fermenters Removing dried krausen rings and fermentation residue Pre-cleaning before sanitizer contact Routine maintenance for reusable fermentation vessels Pair with an appropriate brewery cleaner, rinse thoroughly, and inspect fermenters before sanitizing for the next batch.