1, with soap and a little mixture of ammonia and turpentine, you can remove a lot of dirt on the glass.

2. Scrape off the original words with a knife first, then find a printing place to print your favorite fonts or drawings on the traces and cover the original place.

3. Wash it off with hydrofluoric acid, but you need to pay great attention, otherwise it will damage the glass.

The words printed on transparent glass are all screen printed at high temperature. It is impossible to get the glass down without breaking it. Can only cover or reduce traces, can not be completely removed.

Extended data

Hydrofluoric acid? [1]) is an aqueous solution of hydrogen fluoride gas, which is a clear, colorless, smoky and corrosive liquid with a strong pungent smell. Melting point -83.3℃, boiling point 19.54℃, flash point 1 12.2℃, density 1. 15g/cm? . Soluble in water and ethanol, slightly soluble in ether.

Theoretically speaking, hydrofluoric acid with low concentration is a weak acid, because hydrogen atoms have strong binding ability with fluorine atoms, and hydrogen bonds exist between hydrogen fluoride molecules in aqueous solution, which makes hydrofluoric acid unable to be completely ionized in water. Very corrosive, can strongly corrode metals, glass and silicon-containing objects. Inhalation of steam or contact with skin can cause incurable burns. Laboratories are generally made of fluorite (mainly calcium fluoride) and concentrated sulfuric acid, which need to be sealed in plastic bottles and kept in a cool place.

Reference hydrofluoric acid _ Baidu Encyclopedia