As with any other fabrics, white sublimation Polyester fabric can soon look yellowish because of detergent residue... more 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. Polyester Flag Fabric Manufacturer would like to introduce in details.