How to Wash Polyester & Synthetic Blends
What You'll Need
- Machine wash
- Regular amount
- 1/2 cup (for odor)
Step-by-Step Method
Turn polyester garments inside out to reduce pilling from abrasion during the wash cycle.
Cold water prevents heat damage and reduces static. Use the permanent press or gentle cycle. Add 1/2 cup white vinegar to the rinse cycle if the garment has persistent odor (polyester traps body odor more than natural fibers).
Low heat only or hang to dry. High heat melts polyester fibers (they are plastic) and causes permanent wrinkles and pilling.
- Never use high heat in the dryer (melts and pills polyester)
- Do not use fabric softener on moisture-wicking athletic polyester
- Do not iron on high (melts)
- Polyester athletic wear holds odor because bacteria embed in the synthetic fibers. Pre-soak in 1 cup white vinegar + cold water for 30 minutes before washing to eliminate persistent odor.
- Use a mesh laundry bag for delicate polyester items to prevent snagging and pilling.
- If polyester has a permanent shiny spot from an iron, it is heat damage and cannot be reversed.
Frequently Asked Questions
Polyester fibers are hydrophobic (water-repelling), so odor-causing bacteria lodge in the fiber structure rather than washing away. The fix: pre-soak in vinegar water for 30 minutes, wash in cold water, and skip the fabric softener. Sports-specific detergents (like WIN or Hex) are formulated for this exact problem.
Sources & Methodology
Polyester is a petroleum-based synthetic fiber (polyethylene terephthalate/PET). Its hydrophobic nature causes it to retain lipophilic (oil-soluble) odor compounds that water alone cannot remove. Vinegar disrupts the bacterial biofilm.
Last reviewed: March 20, 2026