The answer to 'plumbing repair slow draining' is that a slow-draining sink or tub is often caused by a clogged drain. This can be due to buildup of hair, soap scum, food particles, or other debris in the drain pipe. Symptoms include water draining slowly or not fully clearing the sink/tub.
Some common solutions include using a plunger to dislodge the clog, using a drain snake or auger to physically clear the blockage, or using a chemical drain cleaner. However, for stubborn clogs or deeper issues, it's best to call a professional plumber who can properly diagnose and fix the problem.