Union Tank Wash Cleaner. Job Category. Union Tank Wash Cleaners Requisition Number : UNION02773 Showing 1 location Job Details. Description. The primary responsibility of the Tank Wash Cleaner is to clean tanks by climbing in and out of the tanks, and then buffing, scrubbing, drying or by using whatever approved process is necessary to work on the tank until it is clean. A High School diploma or GED required. Qualified candidates will also posses...