Multi-choice problem: Choose from the options at the end, and answer how do you do this: How do you get grout lines in the bathroom clean?

Pick from: * Spray the grout with hot water and scrub them with a stiff bristle brush or a grout brush to lift any dirt or grime off the surface.; * Spray the grout with hot vinegar and scrub them with a stiff bristle brush or a grout brush to lift any dirt or grime off the surface.;
Spray the grout with hot water and scrub them with a stiff bristle brush or a grout brush to lift any dirt or grime off the surface.