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The bag actually contains a solvent - one part Simple Green HD to three parts water (it's the purple liquid surrounding the shifter). I used water displacement in the sink to force the air out of the bag before sealing.
Of course, after I did this, I learned that Simple Green makes a product that is designed for this application. Apparently that product presents a reduced risk of pitting aluminium, although I didn't notice any (further) damage to my shifters. I did three cycles of twelve minutes each, six minutes on one side before flipping the bag over and doing the remaining six minutes, changing the solvent between cycles. It's possible that doing more or longer cycles could cause damage to the part.
Fibreglass
Nice, does the vibrations do all that without the water acting as an agent (considering that the ziplock is empty aside from shifters)?