👉 Drain fluid, also known as drain oil or drain grease, is a mixture of water, oil, and other debris that accumulates in drains when sinks or showers are not properly maintained. It forms as a result of water flowing through the drainpipe, picking up dirt and grime along the way. When this mixture reaches the end of the drainpipe, it can solidify due to lower temperatures or become more viscous, creating a sticky, dark substance. This fluid can clog pipes, block water flow, and cause unpleasant odors if not drained or flushed out promptly, making it essential to address drain fluid issues promptly to prevent further damage and maintain proper drainage.