Greg- I did not try the retroclean pennants. But the Oxyclean worked great with these stiff felt pennants from the late 1970s/early 1980s. No color running at all, even on an Astros pennant that had red graphics. I've heard that red spines might color bleed a bit, but I did not have any of those. These are all very stiff felt pennants. I've heard that oxyclean does not work well on older softer felt pennants because the paint can bleed.
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