The answer to 'drain cleaning slow draining' is that a slow draining sink or tub is usually caused by a clogged drain. Common causes include hair, soap scum, food particles, and other debris building up over time. Symptoms include water draining slowly or not at all, and potentially foul odors.
The first step is to try a DIY drain cleaning solution like baking soda and vinegar or a drain snake/auger to clear the clog. If that doesn't work, you may need to disassemble the pipes under the sink or tub to remove a deeper blockage. For stubborn clogs or damage to the pipes, it's best to call a professional plumber who can properly diagnose and fix the issue.