Features: 1. **Powerful Cleaning Action**: Our effervescent toilet bowl cleaner contains citric acid and sodium bicarbonate, effectively tackling scale, rust, and stubborn dirt for a spotless toilet experience. 2. **Long-Lasting Freshness**: Each cleaning block keeps your toilet fresh and clean for up to 15-20 days, ensuring a consistently pleasant environment with every flush. 3. **Easy to Use**: Simply drop a tablet into the toilet tank, let it dissolve for 10-30 minutes, and flush. Enjoy effortless cleaning without scrubbing or harsh chemicals. 4. **Pleasant Deodorizing Effect**: Unlike traditional cleaners, our product emits a refreshing scent with every flush, eliminating unpleasant odors and leaving your toilet smelling great. 5. **Safe and Non-Toxic**: Our formula is designed to be safe for your plumbing and the environment, providing a powerful clean without harmful chemicals or strong smells. Our toilet blue bubble cleaning block contains citric acid and sodium bicarbonate. It can effectively remove the scale, rust and other stubborn dirt on the water tank, water pipe and toilet, so that you can enjoy a spotless toilet. Its use method is very simple: 1. Take an effervescent tablet and put it in the toilet tank. 2. Let it sit for 10-30 minutes to completely dissolve. 3. Press the toilet switch to flush and clean. 4. Effervescent tablets can keep the toilet clean for 15-20 days. This product will not produce a pungent smell during use, and will emit a new smell every time you rinse and deodorize, making the toilet look new.