What do you mean by unloading in front?

This unloading is free, it belongs to public welfare activities, and charging will start next time. Pre-unloading means that this unloading is free and belongs to public welfare activities, and it will be charged next time. This is usually a service provided by a nail salon or beauty salon. When your nails start to fall off, they will help you clean them for free. This is usually a way to publicize their services and attract customers. Please note that the details may vary by region and store. It is recommended to consult relevant stores directly to obtain the most accurate information.