Does this strip enamel off cups (like bleach does)?

I haven't had a problem with this product. Personally I think Astonish is the best one on the market.

Is this a tannin remover or a bleaching agent, or both?

Yes this does remove tannin and it is not a bleaching agent. It cleaned my very badly stained metal coffee flasks exceptionally well and all the stains disappeared.

Can I use on white acrylic worktop

I wouldn’t recommend as you have to leave to soak. I use the Astonish cooker top/counter paste for my worktops and halogen hob. That’s probably better for your purposes

Could I use it on a brown mark left on my ceramic sink? Thanks

Yes. Cover mark in boiling hot water and add 1 spoonful of the powered to the water. Let it cool and rinse with cold water. Repeat if needed

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Astonish Tea/Coffee Stain Remover 350gm

Product ID: 48756953

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Details

Brand
Astonish
Item form
Powder
Scent
Coffee
Specific uses for product
Stain Remover
Material feature
Clean
Item volume
350

⚡Instant stain removal

✨Leaves brilliant shine

🧴Versatile on multiple surfaces

Description

✨ Clean smarter, shine brighter – never settle for dull cups again!

LIMESCALE FIGHTER - Tackles tough limescale buildup for a spotless finish
COMPACT POWERHOUSE - 350g powder format delivers long-lasting cleaning performance
ODOR TASTE NEUTRAL - No lingering smells or aftertaste—pure freshness every time
MULTI SURFACE MASTERY - Perfectly safe for china, metal, plastic cups, pots, and flasks
EFFORTLESS STAIN ERADICATION - Say goodbye to stubborn tea & coffee marks without scrubbing

Astonish Tea/Coffee Stain Remover is a powerful 350g powder formula designed to instantly eliminate tea, coffee, and limescale stains from a variety of surfaces including china, metal, and plastic. It cleans without scrubbing, leaves no aftertaste or odor, and restores a brilliant shine to cups, pots, and flasks—making your daily brew experience effortlessly pristine.