Name the reagents used in the removal of the following types of stains from glasswares. Grease Cuprous oxide Barium Sulphate Mercury residues? ?

1. Grease: Detergent or soap solution
2. Cuprous oxide: Dilute nitric acid or hydrochloric acid
3. Barium Sulphate: Dilute hydrochloric acid or dilute sulfuric acid
4. Mercury residues: Dilute nitric acid or dilute hydrochloric acid

Grease:
- Soap and water
- Acetone or isopropanol
- Dichromate cleaning solution

Cuprous oxide:
- Nitric acid (HNO3)
- Sodium thiosulfate (Na2S2O3)

Barium Sulfate:
- Hydrochloric acid (HCl)
- Sulfuric acid (H2SO4)

Mercury residues:
- Nitric acid (HNO3)
- Potassium permanganate (KMnO4) and sulfuric acid (H2SO4)
- Commercial mercury cleaning solutions (e.g., Mercuriclean)