My little dude is taking a class at the zoo about Texas Wildlife. They just did birds and since we have a pair of hawks and some nice big owls on the property we thought we'd go look for some feathers to add to the teachers collection of local birds' feathers.
Instead we found a very large and pretty turtle shell - complete top and bottom carapace.
Must have not been able to get itself right side up and dried out. There are still a few bits of skin and bone in there (gross I know but the shell was so pretty)

How do I clean out the stuff and sanitize the remaining shell so that the kids can hold and look at it without getting salmonella.

I was thinking of bleach but was worried it would bleach the shell and the pattern is so nice. Maybe dillute? What ratio? Or something else?