Provide advice on how to accomplish the following goal. Give ONLY the advice, no other words or explanation.
For example:

Answer: <advice, as short as possible; a single sentence!>.

Goal: How to scrub grout clean.
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.
Mix baking soda and water, apply to grout, scrub with a toothbrush, rinse.