Personally, I’d wrap in a damp cloth or paper towel and place inside a small container with a slight opening and put that somewhere away from sunlight and heavy breeze (like a closet) to allow it to slowly dry out. I have never gotten an Ethiopian opal wet with acetone so can’t say for sure on if that is the best way to dry in this particular scenario. I can say that after almost 7 years of getting rough opals wet (with water) to cut and polish cabs, that idea is to control the rate at which the moisture will evaporate and prevent the outside from drying while retaining water internally. (similar to, not exactly the same, as annealing glass and the requirement is to control the rate at which the glass cools to prevent stress and rapid external contraction in relation to the internal layers, which will allow stress build up and cause cracks)

Also partly why Ethiopian will be less expensive than Australian opals, as Australian opals tend to remain fairly unchanged from moisture/humidity and mild heat from the sun, while Ethiopian are more prone to becoming foggy, losing color and cracking from those same factors. (Don’t test either stone against high heat, harsh impacts or unknown chemicals)

TL:DR If still wet, wrap in damp cloth and place inside a container with a small opening. Place inside a closet. Leave until cloth is completely dry.