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But you can't dissociate ferric oxide with UV until you get to a power level where the shirt would be vapourised before the stain was touched 🙂
UV is good (or bad, if you don't want things to fade) for breaking up colourful organics into colourless fragments, but useless against most inorganic salts
gbj_tester
You would be suprised how well sunlight will bleach stains out of white cloth too