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By the time you have stirred in the dishwashing soap, the Coke loses a lot of its CO2.

After a bit more research, I added another step.

Give those shells a dip in a 50/50 mix of equal parts water and common vinegar - first .

Next, give it the Coke/soap soak for an hour; rinse well.

Then, a bath of with a tspn of baking soda and water to neutralize the acids used (phosphoric and acetic).

Lastly, a final bath of pure water; then let them air dry.

My shells now look like new pennies in/out.

[QUOTE="Robb, post: 543944, member: 8446"] By the time you have stirred in the dishwashing soap, the Coke loses a lot of its CO2. After a bit more research, I added another step. Give those shells a dip in a 50/50 mix of equal parts water and common vinegar - first . Next, give it the Coke/soap soak for an hour; rinse well. Then, a bath of with a tspn of baking soda and water to neutralize the acids used (phosphoric and acetic). Lastly, a final bath of pure water; then let them air dry. My shells now look like new pennies in/out. [/QUOTE]

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