[header] How to clean grout with toilet cleaner [title] Look for a toilet cleaner that contains sodium hydroxide. [step] Many toilet cleaners contain sodium hydroxide and sodium hypochlorite. These two ingredients help to remove stains and grime on porcelain or tile surfaces as well as grout. 
Though they can be toxic in large amounts, they do work to effectively clean grout. [substeps] You may look for common brands of toilet cleaner at your local hardware store or in the cleaning aisle at your grocery store.