Cleaning: regularly clean the surface to avoid dust and dirt buildup, using a neutral detergent and avoiding corrosive chemicals. Check seals: regularly inspect gaskets for wear and replace if damaged to keep good sealing. Hardware care: periodically lubricate and rust-proof hardware for flexible, durable operation. Glass care: for insulating glass prevent internal fogging; if fogging occurs, contact a professional. Check structural stability: regularly inspect the window structure for looseness and reinforce if needed.