It has been shown that L. monocytogenes can become established and persist in floor drains. Therefore, drains should be cleaned and disinfected in a manner that prevents contamination of other surfaces in the room. Solid forms of disinfectants (e.g., blocks of QUATs) can be placed in drins to help control bacterial growth. Floor drains should not be cleaned during production. High-pressure hoses should not be used to clear or clean a drain, as aerosols will be created that spread contamination throughout the room. Employees who have been cleaning drains should not contact or clean food contact surfaces without changing clothes and washing and disinfecting hands. Utensils for cleaning drains should be easily distinguishable and be dedicated to that purpose to minimize the potential for contamination.