How did the musty smell in the hotel come from?

The musty smell is caused by the growth of mold in the room, and the mold will give off musty smell in the process of being born. As we all know, hotel rooms are generally closed and unventilated. If the hotel is not properly managed, some rooms that have never been used will be cleaned for a long time, and there will be a heavy musty smell inside.

The cause of mildew is often that the room is too humid. There are many reasons for humidity, so I won't give an example here. The common reason is that there is a problem with waterproof treatment, which leads to mildew.

You can use Dr. Mould Mildew and Antibacterial Spray to remove the musty smell.