Instant Power Hair & Grease 1 Liter Hair & Grease Drain Opener. This non-acid formulation is made for the most common drain stoppages. It dissolves hair clogs from bathroom drains and creates heat to melt grease from kitchen sinks. It is among the strongest caustic formulation on the market and the longer it remains in the drain the more drain clogging matter it will dissolve. We recommend that it be allowed to stay in the drain overnight and then flush with hot water. It comes in extra heavy plastic bottles with a sealed top, child resistant cap and a re-sealable safety storage bag. It is safe for septic systems when used as directed.