You could, but what's a wash? Not much after you spent all this time!
Wash it with Dawn or other known good oil/grease removing dishwashing liquid.
Follow right after with Z7 to remove any remaining oils and to remove any Dawn film.
Go and mix your ZFX/Z5 and start applying.
See my link below... This was done with PIII-MG/Menz/FP and Zaino.
Regards,
Deanski