Help with Yeti cup. Is this rust or a stains from black tea? I've

Help with Yeti cup. Is this rust or a stains from black tea? I've

40 oz Tumbler with Handle, Reusable Vacuum Tumbler, Insulated Tumbler With Lid and Straws, Leak Resistant Lid, Insulated Cup, Maintains Cold Heat and Ice for Hours (Purple) (Black 1.0): Tumblers

Quencher H2.0 40oz Stainless Steel Insulated Tumblers With Lids With Silicone Handle, Lid, And Straw 2nd Generation Car Mug, Vacuum Insulated Water Bottle From Plastic_cups, $9.11

How to Paint a Yeti Cup or Ozark Tumbler Easily! - Leap of Faith Crafting

What is the best way to clean tea stains from a yeti tumbler?

YETI 21070090001 100098505

How to remove tea stains from this stainless steel cup : r/howto

HOW TO CLEAN BAD COFFEE STAINS - Cleaning a YETI MUG - Denture Tablet CLEANING HACK - Does it work?

YETI Rambler Series 21071060021 Bottle with Chug Cap, 18

This $15 Cleaning Powder To Makes Kitchen Tools Sparkle

YETI Rambler 20-fl oz Stainless Steel Tumbler at

40 oz Tumbler with Handle, Reusable Vacuum Tumbler, Insulated Tumbler With Lid and Straws, Leak Resistant Lid, Insulated Cup, Maintains Cold Heat and Ice for Hours (Purple) (Black 1.0): Tumblers