Most front-load washing machines are high-efficiency (HE), meaning they use less water and energy than standard washers. Saving water and energy is great for both the environment and your wallet, but can cause leftover detergent residue, dirt, soap scum, and hard water accumulation. If left untreated for too long, the odor-causing buildup in your front loader (or top loader) may even hinder your machine’s cleaning performance.