Question

name a solvent to remove verdigris[green solid deposits]from an old brass tap?

Answer 1

The green layer formed on brass substances exposed to sea water, wet air, or acid consists of copper chloride, copper acetate or copper carbonate.

1. baking soda and kerosene with some deodorant -- consists of alcohol
 
2. Alcohol can dissolve copper acetate.

3. Acids can work

4. Salt + ammonia solution