Phil:

About Polygyra: A list member mentioned using the microwave to clean them.
It seems logical that the steam buildup would blow the animal from the shell.
I haven't tried it yet, though. P. cereolus would be a good common test
species.

Andrew V.

Philip L. Poland wrote:

> One other thing. 3% hydrogen peroxide will generally loosen up or dissolve
> organic material that remains stubbornly in the spire. While calcium
> carbonate is impervious to hydrogen peroxide, remember that some shells
> aren't 100% calcium carbonate.