How can you keep homemade icing powdered sugar butter and milk creamy on cake after some time out?

To keep homemade icing that is powdered sugar, butter, and milk creamy on a cake for some time:

- Ensure the icing is made correctly. Use fresh, softened butter, and sift the powdered sugar to avoid lumps.

- Allow the cake to cool completely before spreading the icing. This helps prevent the icing from melting and sliding off the cake.

- When storing the cake, place it in an airtight container in a cool, dry place. This will help prevent the icing from drying out or absorbing odors from the refrigerator or other foods.

- If the icing does begin to dry out, you can add a little bit of milk or cream and mix it until it reaches the desired consistency.

- You can also add some whipped cream or meringue to the icing to make it lighter and fluffier.

- Avoid placing the cake in the refrigerator, as cold temperatures can cause the icing to harden and become difficult to spread.

- If the cake will not be eaten immediately, it can be frozen. Wrap the iced cake in plastic wrap and place it in a freezer-safe container. When you are ready to serve the cake, thaw it overnight in the refrigerator and let it come to room temperature before serving.