I pulled out shoes I haven’t worn all winter and found white fuzzy patches growing on the leather. What is this?

Distinguishing between mold, mildew, and salt stains is crucial for determining the right cleaning approach. Mold typically appears fuzzy and can be white, green, or black, while mildew might look more powdery and is often white or gray. Salt stains, on the other hand, appear as chalky white streaks or blotches and are more common in areas where road salt is used.

A simple test involves dampening a cloth with white vinegar and gently wiping the affected area. Mold and mildew will usually transfer onto the cloth, whereas salt stains will dissolve with the acidic solution, leaving a clear mark on the cloth. This identification step is key to choosing the correct cleaning strategy.

The way shoes are stored during winter plays a significant role in mold development. Enclosed spaces with poor air circulation, such as boxes or plastic bags, trap moisture and create an ideal breeding ground for mold. If shoes are stored in attics or basements, which frequently experience temperature fluctuations, the risk is even higher.