First few minutes
Just happened? Do this first
- Blot up the tea with a clean white paper towel; don't rub.
- Rinse the metal in cool water as soon as you can.
- Once it's cool, wash it with mild liquid dish soap and a sponge.
Tea leaves a tannin stain on metal, and it clings more the longer it sits in a cup, thermos or pot. Fresh tea comes away with cool water and a little mild dish soap, so the sooner you rinse, the easier it is. Old marks take more patience, and some may only lighten instead of vanishing.
Rinse a metal thermos or steel flask with cool water right after use, then wash it with a drop of gentle dish soap. Tea stains in a steel thermos can take several rounds, so be patient rather than reaching for something harsh. Use a soft brush on the inside of a metal teapot, since rough pads scratch the finish.
Before you start
What metal, chrome & tools can take
Safe to use1
- Water
Use with care6
- Hot water
- Soaking
- Chlorine bleach
- Solvents (alcohol, spot removers)
- Acids (vinegar, lemon)
- Scrubbing and abrasives
Avoid1
- Heat, once the stain is out
5 items
What you'll need
Tap an item to get it on Amazon, or tick what you already have.
- Clean white paper towels or a clothto blot up liquid without rubbing it in (opens Amazon)
- Mild liquid dish soapfor the soap-and-water wash (opens Amazon)
- A spongeto wash the stained surface (opens Amazon)
- A bristle brushfor the stubborn spots
- A clean dry clothto dry the metal before you put it away
As an Amazon Associate we earn from qualifying purchases.
6 steps
Step by step
Step 1 of 6
Blot up the excess tea
Empty any tea still inside and blot the wet spots with a clean white paper towel or cloth. Press gently and don't rub, because rubbing spreads the tea over more of the metal.
Step 2 of 6
Rinse in cool water
Rinse the stained area under cool water as soon as you can. Swirl the water around inside the cup, flask or teapot so it reaches the whole stain.
Step 3 of 6
Wash with mild dish soap
Mix 1 teaspoon of mild liquid dish soap with 1 cup of warm water. Dip a sponge in the solution and wipe the stained metal, working over the whole area before you move on.
Careful. Don't apply the solution to a hot cup, flask or teapot; let it cool first.
Step 4 of 6
Brush any stubborn spot
If a brown mark is still there, scrub only that spot with a bristle brush in small circles. Keep the strokes light so the finish stays smooth.
Step 5 of 6
Rinse out all the soap
Rinse the metal under cool water until no suds or soap film remains. Check the rim, the lid seal and the corners, because soap hides in those spots.
Step 6 of 6
Dry it completely
Dry the metal with a clean cloth, then let it air dry until the inside and rim are fully dry. Leave the lid off a thermos or flask so the inside can dry out.
Careful. Leftover moisture causes rust, so don't put the metal away while it's damp.
If you'd rather buy than mix
Best products for tea on metal, chrome & tools
Choose a mild liquid dish soap rather than a bar, and keep a bristle brush for the corners and spout.
Amazon Basics Microfiber Cleaning Cloths
How we picked these: each product is made for this type of stain, its maker doesn't warn against using it on metal, chrome & tools, and its directions fit the steps above.
Finished the steps? How does it look?
Nice work. Let it dry completely and check it again in good light. Here is what done looks like:
How to tell it's really gone →A faint mark usually needs one more round, not a stronger product.
If the stain was already dried or set, the method changes.
Old, dried or set-in stains →When to call a professional →How to tell it's working
The inside and rim should look clear, with no brown tint when you tilt the piece toward a window. If a faint shadow is left, repeat the wash and brush steps once before you dry it.
What changes for yours
Adjust for your metal, chrome & tools
Metal thermos
A thermos is hard to clean because the stain sits in a narrow bottle, so the wash has to reach the whole inside. Fill it with cool water and a squirt of mild liquid dish soap, put the lid on, and shake it gently.
Pour it out, rinse with cool water until no soap shows, then stand it open to dry completely. If a ring remains after one wash, repeat the wash once and let it dry before you judge the result.
Steel flask
A steel flask gets the same wash, but tea collects at the cup and the threads, so wash each piece on its own. Dry the threads well before you reassemble it.
If the outside has a polished stainless finish, the Stainless Steel & Appliances guide covers that surface in more depth.
Metal teapot
Wash the teapot's inside through the lid opening with the sponge and the mild dish soap solution. Work the sponge around the base and sides so the wash reaches the whole inside.
Use the bristle brush on the spout and the rim, where the stain usually builds up. Rinse until no soap shows, then leave the lid off to dry.
Aluminum cup or pot
Aluminum takes the same soap-and-water wash, but it's the metal where the usual extra cleaners go wrong. Keep baking soda, bleach and wire brushes away from it.
Use only the sponge and mild dish soap, then rinse and dry. If the surface looks dull after drying, stop there rather than reaching for an abrasive.
Old, dried or set-in stains
Old tea stains on metal are harder to remove than fresh ones, and some won't come out at all. Repeat the soap-and-water wash and the brush step, then let the metal dry before you judge the result.
Once tea dries on metal, a single wash may not lift the ring it leaves. Repeat the brush scrub with fresh dish soap solution rather than moving to harsher products, because several of them are not safe on metal.
Heat can set a stain, so keep the metal out of hot water and don't apply cleaner while it's warm. If the mark is still there after several careful washes, it may be permanent, and stopping there is safer than trying a stronger product.
Vinegar, baking soda, peroxide and more
Do home remedies work on tea on metal, chrome & tools?
Many home remedies for tea were written for fabric, and several aren't safe on metal at all. Some of these suit tea on metal, some are worth skipping, and some should stay away from your cup, flask or teapot.
Works1Helps1Skip2Avoid3
What makes it worse
Mistakes to avoid
Don't use bar soap on the stain
Bar soap and soap flakes contain natural soap, which makes tea stains harder to remove. Stick to a mild liquid dish soap in water instead.
Don't scrub with steel wool or abrasive pads
They scratch chrome and can damage anodized aluminum. Use the bristle brush instead, even when the mark looks stubborn.
Don't soak the metal in vinegar
Vinegar suits tannin on fabric, but metal shouldn't sit in it. Keep the cleaning to the steps above.
Don't use bleach on a metal you can't identify
Chlorine bleach isn't for non-stainless steel, aluminum or silver, and it should never be mixed with vinegar, ammonia or any other cleaner. If you can't confirm the metal is stainless, skip bleach completely.
When to call a professional
There's no set point where a pro is needed for tea on metal. If the finish starts flaking, bubbling or going dull after cleaning, stop and have the piece looked at before you keep scrubbing.
Questions
How do you clean tea stains from a metal cup?
Blot up the tea, rinse the cup in cool water, then wash the inside with a sponge and mild liquid dish soap. Brush any stubborn spot with a bristle brush, rinse out the soap, and let it dry completely before you use it.
Will tea stains on metal come out for good?
Fresh tea usually lifts with a prompt rinse and a gentle wash. Old stains are harder to remove, and some won't come out, so stop after a few careful washes instead of reaching for harsher products.
Why does tea stain metal?
Tea is a tannin stain, grouped with coffee, berries and fruit juice. That's why it's worth rinsing right away, before the mark has time to set.
Can I use baking soda on a metal teapot?
Not if the teapot is aluminum, because baking soda isn't safe on aluminum. If you can't tell what the metal is, skip it and use the mild dish soap wash instead.
Can I use salt on a tea stain in a steel cup?
Not on stainless steel, because salt isn't safe there. If the cup or flask is stainless, stick to the soap-and-water wash and the bristle brush.
Can the same wash clean a cup, a flask and a teapot?
Yes, the same mild dish soap wash works on all three. Just aim the brush at the spout, rim or corners where the stain sits, and rinse until no soap shows.
Tea on other materials
Other stains on metal, chrome & tools
Start from the bigger picture
How we know this
Every method, amount and warning here comes from university extension services, industry bodies and product makers. We read them, check every step for unsafe combinations and changed amounts, and write it up so you can follow it.