Toilet bowl cleaner tends to be very acidic. pH of 1-3 depending on the type. You stomach and proximal duodenum have the ability to handle that and neutralize it as it enters your intestines.
Your esophagus however does not and will be damaged twice by vomiting it back up. It’s better to dilute it with water and save the esophagus from more damage.
The effects of chemical scalding of the esophagus can be terrible. Look up spit fistula.
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