Where approved, articles that cannot be washed in the usual washing machines are allowed to be cleaned in scrubbing tubs. Scrubbing tubs shall comply with the following:
- Only Class II or III liquids shall be used.
- The total amount of solvent used in such open containers shall not exceed 3 gallons (11 L).
- Scrubbing tubs shall be secured to the floor.
- Scrubbing tubs shall be provided with permanent 11/2-inch (38 mm) drains. Such drain shall be provided with a trap and shall be connected to an approved container.