What type of fabric finish is designed to prevent mildew?

The choice of mildew-resistant fabric finish is the appropriate answer as it specifically targets the prevention of mildew growth. Mildew is a type of fungus that thrives in damp, humid conditions, often affecting fabrics that encounter moisture. The mildew-resistant finish incorporates chemical treatments or treatments that inhibit the growth of mold and mildew on the fabric, ensuring the material remains clean and usable even in challenging environments.

The other fabric finishes mentioned serve different purposes: waterproof finishes help repel water, making the fabric suitable for wet conditions; fire-retardant finishes are designed to reduce flammability and provide safety against fire hazards; and wrinkle-free finishes aim to maintain a smooth appearance free from creases. While each of these finishes has its benefits, only the mildew-resistant finish specifically addresses issues related to mildew, making it the best choice in this context.