My Stanley Quencher H2.0 Developed Rust Despite Proper Use and I Got No Support

On December 13, 2024, I purchased a Stanley The Quencher H2.0 FlowState tumbler from a Karaca store. I’ve used it exclusively for drinking water and followed all care instructions exactly. Despite this, a dark, rust-like stain appeared on the inner bottom surface of the thermos. This is extremely di...











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