to ensure that complete coverage and adequate contact times are achieved. Each phase should start from the highest point and proceed downwards, commencing from the least contaminated areas. However for some equipment, rinsing of surfaces with the disinfectant may be sufficient. When disinfectants are applied to vertical surfaces, care should be taken to ensure that the required contact time is maintained before the disinfectant drains away. Vertical surfaces may need retreatment or the addition of compatible foaming agents to prolong adherence to surfaces.