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The metthylated spirits was never going to remove the iron phosphate.
The meths should have removed any residual water/moisture from the rust converter,
and, degreased the surface prior to painting.
mespilus-
The metthylated spirits was never going to remove the iron phosphate
And you wouldn't want it to. The phosphate conversion coating is a better starting point for paint than bare steel.
gbj_tester
For the record, the methylated spirits didn't remove the black gunk. I wire wooled it where i could and painted over the rest.