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Be VERY careful when moving the contaminated area - the green area that you see is actually billions of tiny spores, and each one has the ability to re-contaminate your casing.
IMO - the best way to do it is to lightly mist with H2O2 FIRST, starting from the outside of the area and moving inwards, and then remove it. This dampens it and keeps the spores from "blowing" back on to your casing.