[72c20customcamper]

Made by Klean Srip bought it at home depot. Called Concrete and Metal prep make sure you use the phosphoric acid type not muriatic. Muriatic cleans faster but can make the metal brittle if it's in
contact to long . I just left the sender in it cause I was replacing it anyway and put a vacuum cap on the outlet . The neck I left the cap on too. I did an overnight soak then agitated it during every so often the next day. Drained it and rinse it with water then a cup of baking soda in a gallon of warm water sloshed it around to neutralize the acid . Left it at that