How is a garment contaminated with a visible impurity (Najasah Mar'iyyah like blood) purified according to the correct opinion?

Methods of Purifying Visible and Invisible Impurities

• Washing it exactly seven times.
• By removing the physical substance itself (zawāl 'aynihā), even if done in a single wash.
• By burying it in clean soil for 3 days.
• Only by burning the affected area.