What are the different kinds of stains and how can they be removed?

Stains can be classified into categories such as protein stains (like blood and dairy), tannin stains (like coffee and tea), dye stains (like ink and food coloring), and oil-based stains (like grease and makeup). To remove protein stains, cold water and enzymatic cleaners work best; tannin stains often respond well to hot water and detergent; dye stains may require a specialized stain remover; and oil-based stains can be tackled with solvents or dish soap. Always test a small area first and follow the care instructions for the fabric. For persistent stains, professional cleaning may be necessary.