Maintaining a hand-opened three-fold printed umbrella for rainproof outdoor use requires regular care to ensure its longevity and functionality. Here are some key points to consider when maintaining such an umbrella:

1. Drying: After using the umbrella in the rain, make sure to open it fully and allow it to dry completely before closing and storing it. Dampness and moisture can cause mold and mildew growth and may damage the fabric.

2. Cleaning: Regularly clean the umbrella fabric with a soft cloth or sponge dampened with mild soapy water. Gently wipe away any dirt, stains, or debris. Avoid using harsh chemicals that can damage the fabric or the printed design.

3. Handle with Care: Be gentle while opening and closing the umbrella to prevent any strain on the frame or the hinges. Avoid using excessive force or snapping it open or shut abruptly.

4. Inspect for Damage: Regularly inspect the umbrella for any signs of damage, such as bent ribs, broken frame parts, or tears in the fabric. Address any issues promptly to prevent further damage.

5. Avoid Windy Conditions: Do not use the umbrella in strong winds or storms. Wind can damage the frame and may cause the umbrella to flip inside out.

6. Storage: Store the umbrella in a dry and cool place when not in use. Avoid leaving it in direct sunlight, as prolonged exposure to UV rays can fade the printed design and weaken the fabric.

7. Keep away from Heat Sources: Avoid placing the umbrella near heat sources such as radiators, heaters, or stoves, as excessive heat can damage the fabric and the frame.

8. Use Umbrella Sleeve: When storing the umbrella, use the provided umbrella sleeve or cover to protect it from dust and debris.

9. Avoid Leaning: Do not lean on or put weight on the umbrella when it is open, as this can strain the frame and the ribs.

10. Replace Worn Out Parts: If you notice any parts of the umbrella that are worn out or damaged, such as the handle, frame, or ribs, consider replacing them with genuine replacement parts.

11. Avoid Contact with Sharp Objects: Be cautious not to poke or puncture the umbrella fabric with sharp objects or pointed tips.

12. Avoid Overstuffing: When folding the umbrella, avoid overstuffing it into the sleeve. Fold it carefully to prevent any strain on the frame or the fabric.

13. Regular Inspection of Printed Design: If the umbrella has a printed design, inspect it regularly for signs of fading or damage. Avoid scrubbing the printed area during cleaning to preserve its appearance.