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: To make razor blades sharper after several uses,
run the razor blades along the side of a pair of jeans.
<Soak razor blades in a solution of hydrogen peroxide and warm water for 30 minutes before shaving.>