Wash it with some aged towels to help with scrubbing. Location it while in the dryer on very low heat For under a few minutes (never leave it unattended), then re-cling it to finish drying. Egress Windows, or as the code phone calls them, EEROs, are outlined in the IBC https://mold-remediation.theobloggers.com/38807159/mold-remediation-things-to-know-before-you-buy