Leaving the door open when cleaning a microwave was a common practice in the past to allow the steam and heat to escape, making it easier to clean the interior. However, this practice is no longer recommended for several reasons:
Safety: Opening the microwave door while it's still operating can present safety hazards. Microwaves emit microwave radiation to heat food, and opening the door during operation can lead to exposure to this radiation, which is harmful.
Interlock System: Most modern microwave ovens are equipped with an interlock system that automatically stops the microwave from operating when the door is open. This safety feature is in place to prevent accidents, such as exposure to radiation or the risk of burning oneself.
Efficiency: Closing the microwave door during operation helps contain the heat and ensures that the microwaves are contained within the oven, allowing for efficient cooking or heating. Opening the door interrupts the cooking process and reduces its overall effectiveness.
Regarding the use of glass cookware, it is true that glass and microwave-safe plastic containers have become more popular choices for microwave cooking. These materials do not interfere with the microwaves and are less likely to cause arcing or damage to the oven. Metal cookware, on the other hand, can cause sparks and potentially damage the microwave or even start a fire.
It's important to follow the manufacturer's instructions for using cookware in the microwave and choose materials that are labeled as microwave-safe. Always refer to the specific guidelines provided by the microwave's manufacturer to ensure safe and efficient operation and cleaning.