How to Clean a Stainless Steel Coffee Cup (And Get Rid of Coffee Smell)

1. Rinse the cup with warm water as soon as it is empty – dried coffee is the source of most smells.
2. Add a drop of dish soap, fill a third with warm water, close the lid and shake for a few seconds.
3. Rinse, take the lid off and let both parts air-dry – open. A sealed damp cup is exactly how musty smells are born.

That is genuinely all a normal day needs. The two most important habits: never let coffee dry overnight in the cup, and never store it with the lid closed.

For coffee smell that survives the daily routine, or brown tea stains on the inside, the kitchen cupboard has everything you need:

1. Put one tablespoon of baking soda into the cup.
2. Fill it with hot (not boiling) water and stir briefly.
3. Let it sit for 30 minutes – for stubborn cases, overnight with the lid off.
4. Scrub gently with a soft bottle brush, rinse thoroughly, air-dry.

For limescale or dull patches, swap the baking soda for a 1:1 mix of white vinegar and water, let it sit for 15 minutes, then rinse well. Use one or the other – mixing both at once mostly produces foam and disappointment.

If your cup smells clean but the first sip still tastes like last week, the lid is the culprit. Milk residue loves the area under the slide mechanism.

The HEY SAHNI lid is completely dishwasher-safe – the easiest deep clean is simply the next dishwasher run. Between runs, an old toothbrush is the perfect tool to get under the slide and around the seal. Rinse with hot water, brush the slide channel, let it dry open.

If a lid has truly reached the end of its life, you don't need a new cup: there are replacement slide lids – and matching bottle lids for the water bottles.

1. Dishwasher for the cup body – possible, but not ideal. The stainless steel itself survives it, but the hot cycles can make the printed design peel over time. To keep the colours beautiful, wash the cup by hand. (The lid, as said, is fully dishwasher-safe.)
2. Abrasive sponges and scouring powder. They scratch the coating – a soft brush does the job without the marks.
3. Chlorine-based cleaners. Bleach and stainless steel are not friends; it can permanently damage the surface.
4. Long soaking with the lid sealed. Trapped moisture is the express lane to musty smells.

This is the quiet sustainability story: the longer your cup lives, the better its environmental math gets. Thirty seconds of care per day is what turns “reusable” from a label into reality – a stainless steel cup treated this way easily accompanies you for years. Made to last is a team effort.