Domakihub How to Clean a Travel Mug and Keep It Odour-Free
Banish coffee stains and stale smells from any insulated mug in minutes.
Reviewed by Domakihub cleaning pros · 2026-06-23 · 4 min read
A travel mug that smells stale or shows brown coffee rings on the inside is one of those small annoyances that adds up fast — especially in a rental property or hotel where guests notice everything. The video above walks through the core technique hands-on; this article breaks it into five clear steps with the supplies most Greek households and holiday rentals already have on hand. Follow this routine weekly (or between guest stays) and your mugs will look and smell as though they just came out of the box.
Why travel mugs need special attention
Unlike a standard ceramic cup, a travel mug has a lid with narrow channels, a double-walled body, and — if it is stainless steel — a surface that holds coffee tannins stubbornly. Running it under hot water or dropping it in the dishwasher (which most manufacturers advise against) rarely reaches the spots where residue hides.
Stale odours come from coffee oils and tea tannins that cling to the metal and rubber seal. Once they build up, even fresh coffee will taste off. A targeted clean with mild acid or gentle abrasion breaks that residue down without scratching the interior coating.
What you will need
You do not need specialist products. White wine vinegar, baking soda, dish soap, a bottle brush, and a small detail brush (an old toothbrush works perfectly) cover every method described below. For stubborn stains, a single denture-cleaning tablet or a small amount of bicarbonate of soda will act as a mild fizzing agent to lift residue from hard-to-reach corners.
All of these are widely available at supermarkets across Greece — AB Vassilopoulos, Sklavenitis, and most local minimarkets stock white vinegar and bicarbonate of soda year-round.
5 steps to a spotless travel mug
- 1
Disassemble the lid completely
Pull apart every removable component of the lid — the sliding cover, the rubber seal, and any silicone gasket. These small parts trap the most residue and are the main source of stale smells. Lay them in a bowl of warm soapy water to soak while you work on the body.
- 2
Scrub the interior with baking soda paste
Mix one tablespoon of baking soda with just enough warm water to form a thick paste. Spoon it into the mug, then use a bottle brush to work it over the entire interior surface, paying particular attention to the bottom and the ring line where liquid sits. The mild abrasive action of baking soda lifts coffee and tea stains without scratching stainless steel.
- 3
Deodorise with white vinegar
Fill the mug halfway with equal parts white wine vinegar and warm water. Swirl it around and let it sit for 10 to 15 minutes. Vinegar is a natural acid that dissolves tannin build-up and neutralises the sour smell that warm liquids leave behind. Pour it out, then rinse thoroughly with clean water until you can no longer detect the vinegar scent.
- 4
Clean lid parts with a detail brush
Use an old toothbrush or a small detail brush to scrub around the hinge, the drinking spout, and the inside of the rubber seal. These corners are almost impossible to reach with a cloth but are exactly where mould spores begin if moisture is trapped. A quick dip in a diluted vinegar solution before scrubbing makes the job faster.
- 5
Dry fully before closing
This step is the one most people skip. Reassemble the lid only after both the mug body and every lid component are completely air-dried — standing upright on a drying rack with the lid placed alongside it, not closed on top. Trapping moisture between the lid and the body is the single biggest cause of musty smells returning within days. In Greek summer humidity this matters even more.
Rather have a pro handle it?
Get a vetted cleaning pro in your city — one number, booked in EN/EL/DE.
FAQ
- Can I put a stainless steel travel mug in the dishwasher?
- Most manufacturers advise against it. Dishwasher heat and detergent can warp the lid seal, strip vacuum-insulation performance over time, and leave a metallic aftertaste. Hand-washing with the baking soda and vinegar method takes only a few minutes and keeps the mug in better condition longer.
- How do I remove a very stubborn brown stain from the bottom of the mug?
- Drop one denture-cleaning tablet into the mug, fill with warm water, and leave it to fizz for 30 minutes or overnight for serious build-up. The effervescent action reaches the base and the sides without any scrubbing. Rinse well afterwards. This is especially effective on mugs that have not been cleaned for several weeks.
- How often should travel mugs in a rental property be deep-cleaned?
- Between every guest stay as a minimum. For a property in regular use, a full deep-clean (disassembly, baking soda scrub, vinegar soak, and full dry) once a week prevents stains from bonding to the metal and keeps mugs guest-ready without extra effort.