How to trim grass like a pro Soak Your Trimmer Line: To extend its life and keep it flexible, soak your trimming line in water before use. If you’re storing it for a while, remove the line and soak it for 24 hours beforehand. Understand the Spin Direction: If your trimmer line spins counterclockwise, it will eject cut grass from the left side, making the right side more effective for trimming. Trimming Long Grass: The lower inches of long grass are denser and can cause clogging. For the best res