Q&A for How to Clean Sand Dollars

First, place the shells in a saucepan and cover them completely with warm water. Then, bring the water slowly to a boil and let it boil for five minutes. The boiling action will either remove or loosen and any material still on the shell. Just remember not to put the shell into water that is already boiling — it may crack the shell.

No. Use a clear aerosol or "paint on" lacquer. Minwax makes a good one you should be able to find in most hardware or woodworking stores. Be careful that it is clear, not tinted.

While bleach often is used as a disinfectant, using it on seashells, sand dollars or other aquatic collectibles often changes the natural color of the shell.

Use hydrogen peroxide 30%. You can find this online. Wear gloves because it will burn your skin. You'll need to rinse several times in clear water before putting out in the sun to dry.