How do you use Kleen Out sulfuric acid drain opener in toilet?

Use a plunger to attempt to clean out the toilet blockage first. Pour the sulfuric acid into the toilet. Allow the sulfuric acid to set for 30 minutes. Flush the toilet. Repeat Steps 1 through 4 if the toilet fails to flush properly.

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Keeping this in consideration, what is the best liquid to unclog a drain?

Drano Max Gel Best Overall Drain Cleaner: Drano Max Gel Liquid Clog Remover. Best Drain Cleaner for Hair Clogs: Liquid Plumr Clog Destroyer + Hair Clog Eliminator. Best Enzymatic Drain Cleaner: Bio Clean. Best Monthly Build-up Remover: CLR Clear Pipes & Drains. What acid do plumbers use to unblock drains? Hydrochloric acid Hydrochloric acid, also known as muriatic acid, is the most common acid used by plumbers to unclog drains. Although this component can be found even in your own stomach, as part of the digestive acids, its pure concentrated form can only be purchased from certain stores if you carry a plumber's license.

And another question, why does my shower drain smell like sulfur?

Why Does My Shower Drain Smell Like Rotten Eggs? A rotten egg smell is caused either by biofilm clogging the shower drain or the backup of sewer gasses through the drain. Decomposing biological debris trapped in the drain produces an odor and must be removed to eliminate the smell.