How to Wash Microfiber Cleaning Cloths for Glasses: Detergents, Air-Drying & Lint Prevention

Optical microfiber cloths are engineered from a dense matrix of polyester and polyamide fibers split to 1/100th the diameter of a human hair. Unlike cotton fibers (which are round and push dirt), split microfibers have aster-shaped cross-sections that generate positive electrostatic charges, physically trapping grease molecules and silica particles inside microscopic crevices. When those crevices become clogged with skin sebum, the cloth loses its electrostatic grip and begins smearing grease back onto the lens.

$$\mathbf{\text{Fabric Softener}} = \mathbf{\text{Cationic Surfactants + Silicone Oils}} \implies \mathbf{\text{Permanently clogs microfibers}}$$

Fabric softeners coat textile threads in a microscopic layer of synthetic waxes and silicone oils to make cotton feel soft. When applied to microfiber, these silicone oils permanently coat the split wedges, completely neutralizing their ability to absorb oils. The cloth will forever smear silicone oil onto your glasses.

1. Fill a small bowl with warm water ($30-40^\circ\text{C}$).
2. Add 2 drops of standard bleach-free, fragrance-free liquid dish soap or clear liquid laundry detergent.
3. Massage the microfiber cloth between your fingers for 60 seconds to release trapped facial sebum and grease.
4. Rinse thoroughly under cool running tap water until all soap bubbles are gone.
5. Air dry only: Hang the cloth to dry naturally. Never tumble-dry with high heat or dryer sheets.