Cleaning waterproof schoolbags requires brushes, and the specific operation steps are as follows:

1. Get your schoolbag and brush ready.

2. Pour a proper amount of laundry detergent into the basin.

3. Turn on the tap.

4. Put the water in the basin.

5. Dip the schoolbag in the water.

6. Brush the inside and outside of the schoolbag with a brush.

7. Put clear water into the basin.

8. Wash the schoolbag with clean water again.

9. Dry the washed schoolbag and complete the operation.