Cleaning biro of a shell?!

[piecesofwhat]

Hello,

Your shell looks already pretty. This kind of shell (auger) can be cleaned with bleach. Please read this page :
http://seashell-collector.com/beginners/...aning.html
Bleach only removes non mineral stuff like periostracum etc..

When the shell is cleaned, you shall use mineral oil and this will make your shell really shiny.

Cheers,
DAVID

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oops. Accidentally replied nothing to your post..!

Thank you David for your reply.

I had a look at that actually, but it didn't answer whether biro ink can be cleaned of the shell - probably not..
Also, that isn't my shell - it is just a random image I got from the internet to show what type of shell it was!