Pour slowly and low to avoid splashing. Immediately close the toilet lid.
Have you used caustic soda before? Share your experience (or warning) in the comments. caustic soda unblock toilet
If a plunger, hot water, and dish soap have all failed, you’re facing a serious clog. For stubborn organic blockages (toilet paper, feces, vomit, or grease), caustic soda (sodium hydroxide) can be an effective last-resort chemical cleaner. Pour slowly and low to avoid splashing