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Crawlers are used to gain visual access to drains. Waterproof high-tech cameras are used for drain surveys because they work even under flowing water. After a drain survey, you can contact a drainage company to schedule an appointment.

The boiling water will help dissolve grease. A solution of salt and boiling water can break up the stuck matter. For natural matter like hair, grease, or soap, a cleaning product may be best for your blocked sink.