Some people warn against bleaching because the shell might absorb the smell and that can't be gotten rid of. Also, it can ruin the color. So, if you are bleaching your shells, don't leave them in the solution too long. ... Don't worry – the shells are only this shiny after first applying the mineral oil.

What is the proper way to clean seashells?

Rinse your shells in a large bowl with a little dish soap. This should be a rough clean, just to remove any large pieces of dirt. From there, you can rinse your shells and then place them back in the large bowl, and soak them in a 5o-50 water and bleach solution.

How do you clean seashells without bleach?

Bring water with shells to a boil. Let the water come to a rolling boil for about 5 minutes ( longer if you have a lot of shells or larger ones). Using tongs, take shells out and put them on a soft surface (like a towel) to cool. Your done and now know how to clean seashells without using bleach!