As with any other fabrics, white sublimation Polyester fabric can soon look yellowish because of detergent residue that hasn’t been rinsed off properly and got stuck in the fibers. Bleach is always the first agent that comes to mind, BUT it will damage your polyesters.

That said, for yellowed white polyester fabrics, here’s what you need to do:

Make a detergent-vinegar solution by mixing equal parts of distilled white vinegar and detergent. You may also replace the vinegar with water.
Soak the fabrics in the solution for six to eight hours.
Remove the fabric from the solution and drain the tub.
Remove excess water from the fabric without wringing it. You can gently press on the wet fabric.
Rinse the fabric with running water or clean water placed in a clean basin, tub, or sink.
Remove excess water as discussed above.
Wash the fabric starting from Step #3 (handwashing) up to the last step of how to wash polyester garments.
For colored polyester items that have lost their brightness, use oxygen-based brighteners instead of color-safe bleach. Bleach-based or chemical-based brighteners will strip away the fabric’s coating.

With your eco-friendly, oxygen-based brighteners, here’s what you need to do:

Dilute your oxygen-based brightener with the right amount of cold water. Follow the product’s directions.
Submerge your polyester garments in the solution.
Let them soak for at least two hours, longer for those that are too dull.
Rinse the fabric with running water or clean water placed in a clean basin, tub, or sink.
Remove excess water as discussed above.

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