There is something wrong with my Dopper

• There's something wrong with the ring in my Dopper
• It is impossible to tighten the cap to close my Dopper
• My Dopper Original is dirty
• My Dopper is leaking
• A part of my Dopper Original is damaged
• My Dopper has a production error

• How do I clean my Dopper Glass and how do I keep it that way?
• My Dopper Glass broke

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