Unfortunately retrobriting doesn't take off surface dirt or ink or similar. Painting-like surface preparation is required beforehand. Just dumping sort-of-casually clean parts in the solution will lead to splotchiness and areas that don't get cleaned. The official site recommends a gentle dishwasher cycle, I've had luck with that.
In a way, its good it works that way. It doesn't strip off the apple logo or "mac" lettering or whatever.
Your theory is reasonable but it seems its actually breaking down a bromine based fire retardant. Bromine itself is kinda gross brown color and some oxides like dibromine pentoxide are clearish-white so its quite realistic that hitting it with an oxidizer clears things up.
In a way, its good it works that way. It doesn't strip off the apple logo or "mac" lettering or whatever.
Your theory is reasonable but it seems its actually breaking down a bromine based fire retardant. Bromine itself is kinda gross brown color and some oxides like dibromine pentoxide are clearish-white so its quite realistic that hitting it with an oxidizer clears things up.