There is something wrong with my Dopper

• My Dopper is leaking
• My Dopper Original is dirty
• How do I clean my Dopper and how do I keep it that way?
• There's something wrong with the ring in my Dopper
• It is impossible to tighten the cap to close my Dopper
• A part of my Dopper Original is damaged

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• My Dopper Glass broke

• My Dopper Steel (800ml) is broken or incomplete
• My Dopper Steel is mildewed
• My Dopper Steel is leaking