48 buick,
you should still degrease the parts prior or after blasting. I've ruined a 4 gal batch of solution by slopiness. Things like automotive brake and oil hoses, wheel hubs, diff covers etc. absorb tons of oils and detergents (acidic) over time and will throw the tank PH if you are not careful. I've adopted a 30 min den. acohol bath + 10 min distilled water soak prior to plating. I get rewarded with excellent results every time and the solution that outlived 3 sets of anodes. However, my second tank just got killed by Chinese electronics - do not trust timers!
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