Like any young child’s toy, it will be important to sterilize wooden puzzles periodically. However, there are certain parameters to keep in mind, such as using a safe, nontoxic cleaner such diluted vinegar placed in an empty spray bottle that will actually disinfect the pieces without being harmful to the child. Another thing to always remember is not to soak any of these pieces in water, as water is an enemy of wood. The best course of action is to get a spray bottle of the nontoxic cleaner of choice, spray the toy with the cleaner, then using a damp washcloth go over the toy once more. Afterward, gently pat down the toy with a dry sterile towel, then place the pieces in a dry spot for them to air dry, usually overnight. There are several step-by-step tutorials that can be found online that will guide you through sterilizing wooden puzzles and other wooden toys.