Ironing out wrinkles on a polyester flag?

To remove wrinkles from a polyester flag, you can use a steam iron set to a low heat setting or a garment steamer. Hang the flag vertically and gently pass the iron or steamer over the fabric, keeping it at a safe distance to avoid melting the polyester. Alternatively, you can place a damp cloth over the flag and use the iron on a low setting to smooth out the wrinkles. Always test a small area first to ensure the fabric won't be damaged.