Objective: How to scrub grout clean.

Which of the following solutions is more sound in terms of naive physics reasoning?

Choose from:
- In a bucket, mix vinegar and water in equal parts. Using a brush, dip it in the mixture and wipe down the grout in a grid fashion in order to ensure equal coverage and time spent without missing a spot.;
- In a bucket, mix vinegar and water in equal parts. Pour this mixture into a spray bottle and use it to spray down the grout by gently squeezing the trigger. Let sit for 5 minutes and wipe away with a brush.;
In a bucket, mix vinegar and water in equal parts. Pour this mixture into a spray bottle and use it to spray down the grout by gently squeezing the trigger. Let sit for 5 minutes and wipe away with a brush.