Before attempting removal of corrosion, affected areas cleaned of all paints, waxes, greases, oils and other substances using which mild solvent?

• A. Acetone
• B. Prepsol
• C. Water and detergent
• D. Mineral spirits

Answer: (B)

Before removing corrosion, the surface must be free of oils, greases, waxes and other contaminants without damaging the metal or any coatings. A mild solvent that effectively dissolves these substances and dries quickly with little residue is ideal. Prepsol fits this role in aviation maintenance: it cleanly dissolves oils, greases and waxes, evaporates rapidly, and leaves a clean, dry surface ready for corrosion treatment. Acetone is more aggressive and can harm certain coatings or plastics; water with detergent often won’t remove stubborn hydrocarbon residues; mineral spirits are milder but may not remove waxes or heavy oils as effectively and can leave a film. So Prepsol is the best choice for preparing the area before corrosion removal.