Atmos Fresholator Pipe Cleaning Fluid can be used to clean excess tars from the inside of the pipe and stem. For cleaning pipes, dip a pipe cleaner in the Atmos Fresholator and scrub the interior of the stem and shank, then Wipe the interior of the bowl with a cloth saturated with Atmos Fresholator. Atmos Fresholator Pipe Cleaning Fluid will remove the bitterness and keep your pipe smoking sweet.