Name a common cleaning method for insulators in polluted environments.

• A. Soaking in acid solution
• B. Wet washing with water and a mild detergent using appropriate tools, followed by thorough rinsing
• C. Dry brushing with a stiff brush
• D. No cleaning needed

Answer: (B)

In polluted environments, insulator surfaces accumulate salts, dust, and other contaminants that create conductive films when moisture is present, increasing leakage current and reducing insulation effectiveness. Cleaning aims to remove these deposits and restore a clean, hydrophilic surface that conducts water away properly.

Wet washing with water and a mild detergent, using appropriate tools and insulated handles, followed by thorough rinsing, is the best approach because it gently lifts and dissolves contaminants without attacking the material. The detergent helps loosen grime, and generous rinsing removes both the loosened dirt and detergent residues, leaving a clean surface ready to shed water.

Soaking in acid solution is too aggressive for many insulators and can damage materials or coatings. Dry brushing may remove loose dirt but often fails to remove embedded salts and pollutants and can abrade the surface. Leaving the insulator unclean allows pollutants to continue forming conductive paths, so cleaning is necessary in polluted environments.