The proper etiquette in this situation is for the guest who prepared the dinner to clean up the kitchen afterwards. It is a way of showing appreciation and respect for the effort they put into preparing the meal. As the host, you can offer to help with cleaning up, but the responsibility usually falls on the guest.
However, different situations and cultural norms can influence this practice. Some guests may feel more comfortable with the host handling the cleanup, while others may insist on taking care of it themselves. In any case, communication is key – you can discuss it with your guest and find a solution that works best for both of you.
Remember, the most important thing is to be gracious and thankful for the meal prepared by your guest, regardless of who cleans up afterward.