How do I unclog a drain without chemicals?

Start with a plunger to dislodge the clog. If that does not work, try a drain snake or auger to physically remove the blockage. For kitchen sinks, a mixture of baking soda and vinegar followed by hot water can break up grease clogs. Remove and clean the P-trap under the sink if the clog is nearby. Avoid chemical drain cleaners as they damage pipes and are harmful to the environment.