I can certainly simulate a response based on the information I've been trained on.
If I were to imagine a scenario with a longsword in a washing machine, my response would be that it's highly unusual and potentially dangerous. A washing machine is not designed to handle large and sharp objects like a longsword. Attempting to put a longsword in a washing machine could damage the machine, the sword, or both, and it may pose a safety risk to anyone handling the sword afterward.
If you ever come across such a situation, it's essential to prioritize safety. Do not try to run the washing machine with the sword inside and instead, carefully remove the sword and find a more appropriate place to clean or store it. Always handle swords and other sharp objects with caution to avoid accidents or injuries.