How to clean the dirt on the bathtub?

Cleaning the dirt on the bathtub requires preparation: hot water and cleaning agent. The specific operation steps are as follows:

1. First, heat the bathtub with water, as shown in the figure below.

2. Next, add a spoonful of professional cleaner to the bathtub, as shown in the figure.

3. Stir the bathtub below to generate foam and keep it for ten minutes, as shown in the figure.

4. Next, it is enough to focus on cleaning the particularly dirty parts of the bathtub, as shown in the figure.

5. Finally, take a look at the dirt on the bathtub and clean it, as shown in the figure.