I use Hydrogen Peroxide regularly in my water
business to remove many stains. I usually use a stronger
concentration of 17% H²O² to treat stubborn stains, but get good results
with the OTC 3% solution, as well. The peroxide reacts with the stain by
adding extra Oxygen Ions, and will often clean off the Iron particles. Another
common cleaner is dilute Hydrochloric Acid (or Muratic Acid), but too
strong might have an effect on the plastic. I've not tried that on
Polystyrene plastics, although there is little effect on Polyvinyl-Chloride type
plastics.
Be very careful with either product, though.
Either can cause chemical burns to bare hands from excessive
exposure.
A mild form of these cleaners is the OTC product
C-L-R. Soaking might be required, but sometimes that might do the
trick.
Good Luck,
Mike Higgins
1955 Belvedere Sport
Coupe
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