Try a couple of tablespoons of baking soda down the drain. Then wash down with vinegar until foaming stops. Repeat. Repeat. Repeat. It won't hurt to flush with hot water between each treatment.
Good Luck.
__________________
Jan and Rocky
Volunteers USFWS. 9,300 hrs each, 29 refuges. 04 Allegro 30DA, WH 8.1, Banks, 2012 Jeep Liberty , Brake Buddy Adv Select, 300watts Solar,  "Philippians 4:11-13 KJV"
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