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Simple green is similar to an Apc. I'd dilute it 5:1 and try it. Try a small area first as vinyl is fickle and you might stain it.
Then again it's already stained so maybe you'd have nothing to lose. Just wanted to warn you before you try it.
You can also use something like VRT or another plastic treatment that might cover up the spots. Won't fix it but might mask it
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