Use a screwdriver to remove the screws from the red frame? Left tight and right loose?
are you lifting this pulsator up? You'll find it's full of garbage deposits? It's a lot dark, so you need to put some water at this time? Pour some washing powder? Just clean it with a brush.
after a rough brush? Draining the water? Pour more water and rinse it a few times, and it will be clean!