removing abrasive from sandblasted valve covers/manifolds?

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    I normally sandblast everything before I powder coat it. on valve covers or intake manifolds the abrasive always gets stuck in the oily surface

    I’ve been submerging the parts in hot water, pre heating in the oven to release some of it, blowing out with air, ect. but it seems like it doesnt all come out.

    how do you guys prep these parts?

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