Yes, detergent caps can potentially melt in the dryer. Most detergent caps are made of plastic, and plastic can melt or deform when exposed to high heat. Dryers generate significant heat during their operation, especially during the drying cycle, and if a detergent cap accidentally ends up in the dryer, it can be subjected to that heat.
To prevent detergent caps from melting in the dryer, it is important to be cautious and ensure they are not placed inside the dryer along with the laundry. Always remove the detergent cap from the detergent bottle before putting clothes in the dryer.
Additionally, it's a good practice to check the dryer drum and lint trap before each use to make sure no small items, including detergent caps, are accidentally left inside. This can help avoid any potential damage to the dryer or the items being dried.