Whether or not you should put a measuring cup into the dishwasher after using it to measure water depends on the material of the measuring cup and the dishwasher's instructions. Here are some general guidelines:
Plastic Measuring Cups: Many plastic measuring cups are labeled as dishwasher-safe and can be safely placed in the dishwasher's top rack. However, over time, frequent exposure to high temperatures and harsh dishwasher detergents can cause the markings on some plastic measuring cups to fade. If the measuring cup is of lower quality or you want to preserve the markings, it's better to wash it by hand.
Glass Measuring Cups: Glass measuring cups are generally safe to be washed in the dishwasher, especially if they are made of tempered glass, which is designed to withstand temperature changes. However, some glass measuring cups may have external markings or measurements that could wear off over time due to dishwasher use. Washing by hand might be preferable for these types of glass measuring cups.
Stainless Steel Measuring Cups: Stainless steel measuring cups are typically safe to put in the dishwasher. They are durable and can withstand dishwasher cycles without any issues.
Before placing your measuring cup in the dishwasher, always check the manufacturer's instructions or any labels on the cup for dishwasher safety guidelines. If you're uncertain about whether your specific measuring cup is dishwasher-safe, it's safer to hand wash it using warm soapy water.
Additionally, some people prefer to hand wash measuring cups regardless of their material to ensure they stay in good condition and retain their accurate measurements over time. Hand washing can be gentler on measuring cups and reduce the risk of damage or fading.