Carefully push down on childproof cap with palm of hand and turn cap counterclockwise. Don't squeeze bottle or splash product. (Clean up any spills at once.) To lock cap, push down on cap and screw on tightly.
Pour whole bottle slowly down the drain.
Allow to work for 15 minutes. For tough problems, allow 30 minutes.
Flush with hot water. Repeat steps two, three, and four if necessary.