How can the tea rust on the glass be washed off

Tea rust on glass cups can be removed by soaking in white vinegar, scrubbing with baking soda, dissolving in citric acid, rubbing with salt, or using specialized cleaning agents. Tea rust is mainly formed by the oxidation and deposition of tea polyphenols, and long-term accumulation may affect appearance and hygiene.

1. Soak in white vinegar

Mix white vinegar and water in a 1:1 ratio and pour into a cup. Soak for 2-3 hours and then wipe with a soft cloth. Acetic acid can decompose the alkaline components in tea rust, making it suitable for stubborn tea stains. Ceramic cups or glass cups can be used, avoid using them for metal inner wall containers.

2. Baking Soda Scrubbing

Take a small amount of baking soda powder and add water to make a paste. Dip it in a sponge and repeatedly scrub the tea rust area. The micro particles of sodium bicarbonate have a dual effect of physical friction and chemical neutralization, and should be thoroughly rinsed after cleaning to avoid residue.

3. Citric acid dissolution

Fresh lemon slices can be wiped directly onto the cup wall, or the citric acid powder can be dissolved in warm water and soaked. Citric acid can bind with metal ions in tea rust, making it particularly suitable for removing brown iron deposits while leaving a fresh fruity aroma.

4. Rub salt

Wet coarse salt particles and wrap them with fingers or a soft cloth to scrub. Salt crystals can enhance mechanical friction and are suitable for angular positions such as the mouth and bottom of the cup. When used in conjunction with hot water flushing, the effect is better, but attention should be paid to the strength to avoid scratching the cup wall.

5. Special cleaning agent

Choose a food grade cup cleaning agent containing sodium bicarbonate, dilute it according to the instructions, and soak it. This type of product is designed for tea and coffee stains, with the ability to kill bacteria and decompose organic pigments. After use, it must be rinsed repeatedly with clean water.

Daily recommendation: Rinse the cup promptly after drinking tea and thoroughly clean it once a week. Avoid scratching with hard objects such as steel wire balls. Glass cups can be regularly boiled and disinfected with boiling water. If tea rust seeps into the cracks of the cup body or is not cleaned for a long time, causing damage to the glaze surface, it may be necessary to replace the cup with a new one. For craft cups with carvings or coatings, mild citric acid or baking soda cleaning methods are preferred.