Washing machines and dishwashers invented the Rinse Cycle many decades ago, to remove unwanted cleaning chemicals from the washed items. Apply that principle very thoroughly, when washing electronics with detergent. That is: give your washed PC parts a very thorough wash in water only, after washing in water+detergent.
And don't rush the drying phase. 99%+ of the water will be gone relatively quickly. It's the last <1% hidden in those tight nooks and crannies that'll get you.
I don't recommend hot drying, e.g. in an oven. It unnecessarily subjects an entire card, particularly all metal components, to the shock of thermal stress (expansion and contraction). Which may or may not have detrimental effects, but why take the risk?