I agree, I think you don't need to pay the mana cost. A combined spell is about having two unrelated effects using the same combined Imago, which requires a minimum of Gnosis 3 (core book page 86). This one is a custom spell using two Arcana, so no need for the penalty. But otherwise it looks good to go.
Body Control seems to be over Reaching by two, since its a Ruling, which means only one free Reach at Life 2. Philly would need one Reach to go over her spell control (since she cast the Bibbidi-Bobbidy-Boo first), one for instant use and one for advanced duration. However, I think a Potency primary Life and Matter spell could be used to remove all dirt, sweat, bacteria and similar, which can be used both to clean and sanitize (diminishing the severity of pathogens in the area by Potency). Using that will allow her to instantly clean up without having to sustain an effect.
Body Control seems to be over Reaching by two, since its a Ruling, which means only one free Reach at Life 2. Philly would need one Reach to go over her spell control (since she cast the Bibbidi-Bobbidy-Boo first), one for instant use and one for advanced duration. However, I think a Potency primary Life and Matter spell could be used to remove all dirt, sweat, bacteria and similar, which can be used both to clean and sanitize (diminishing the severity of pathogens in the area by Potency). Using that will allow her to instantly clean up without having to sustain an effect.
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