I've cleaned hundreds of Haminoea.  My method is similar to Chris'.  Fill a
nice quart container with wide mouth (Tupperware) with water and dump in
shells.  Change water at least daily to eliminate acids from decay.  About
the third day with the container about 1/4th full add water from faucet at
high pressure (high enough to swirl the water, but not so much as to force
contents out) until about 3/4th full.  If the animals are deteriorated
enough, the swirling water will wash them out of the shell.  Empty to about
1/4th water and repeat.  If unsuccessful, wait another day and try again.
This technique gets the animal out ASAP and rarely damages lips.  I don't
bleach.

Marlo

-----Original Message-----
From: Chris Takahashi
Sent: Wednesday, May 23, 2012

Put in large 1litre container of fresh water, change daily for 3 days until
meat "floats" out. Need the water to dilute the acid of animal decomposing.
Then add a capful of bleach(roughly 3-5% solution) for about 15min. Rinse.
Been doing this for years with no smell, staining, or shell bleaching.

From Ron Noseworthy:

Yesterday I obtained several species of bubble shells after a trip to a new
locality during a minus tide.  Among them are Haloa japonica (Haminoeidae)
and Bulla vernicosa (Bullidae).  The fleshy bodies completely cover the
rather fragile shells.  How can I clean them properly without breaking the
shells?

Any information anyone can give me will be much appreciated.

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