Storing your triangle powder puff correctly is an essential step to ensure its longevity and maintain its efficacy. Here are some steps you can follow:

1. Cleanse Regularly: Before storing, ensure that your puff is clean. Regular cleansing prevents the buildup of makeup residue and bacteria, which can degrade the material over time. Use a gentle, fragrance-free soap or a specialized makeup brush cleanser. Rinse thoroughly and squeeze out excess water.

2. Dry Completely: After washing, allow your puff to dry completely. Dampness can encourage the growth of mold and bacteria. Lay it flat on a clean towel in a well-ventilated area. Avoid drying it in direct sunlight as it can cause discoloration and degradation of the material.

3. Store in a Cool, Dry Place: Once your puff is completely dry, store it in a cool, dry place. Avoid places with high humidity like bathrooms, as they can encourage bacterial growth.

4. Use a Protective Case: If possible, store your puff in a protective case or a breathable bag. This will protect it from dust and other environmental contaminants.

5. Avoid Stacking: If you have multiple puffs, avoid stacking them on top of each other. This can cause them to lose their shape over time. Instead, store them side by side.

6. Regular Replacement: Despite your best efforts, remember that all makeup tools have a lifespan. Regularly replace your puff to ensure that you're applying your makeup with a tool that's in its best condition.

By following these steps, you can ensure that your triangle powder puff remains in good condition for as long as possible.