Our multi-functional oxygen-activated cleaning effervescent tablets are carefully formulated with sodium bicarbonate and citric acid. Designed specifically for thoroughly removing dirt and oil stains. The usage method is extremely convenient: Soak the clothes and effervescent tablets in water, wait for 5 to 10 minutes to dissolve the stains, gently rub them by hand, and rinse them clean with clear water. And it has a remarkable cleaning effect, is quickly absorbed, and leaves you fresh and clean after use.