In most cases, manufacturers state whether a utensil is dishwasher-safe. At times though, there may be no sign of dishwasher safety on the dishes. Dishes made from plastic, glass, wood, and aluminum are not fit for washing in the dishwasher. This means that the best way to clean these dishes is by hand-washing. There's no way you can make a utensil more dishwasher-safe. Even so, if you want to put these utensils in the dishwasher, you can do a few things to enhance safety. Extreme heat and harsh detergents are the two leading causes of utensils damage. To improve the safety of your dishes, set the temperature low and use a mild detergent. This will prevent any possible melting or corrosion.