Instant Power Hair & Grease drain opener quickly opens drains and removes unwanted clogs. It is the solution for the most common drain stoppages. Dissolves hair clogs from bathroom drains and creates heat to melt grease from kitchen sinks. This is the strongest nonacid formulation on the market. 20 times stronger than common drain openers. Allow Hair & Grease drain opener to stay in the drain overnight. The longer it remains in the drain, the more drain clogging material it will dissolve. No. 1969: Size: 1 L, Type: Nonacid, Physical Form: Liquid No. 1970: Size: 2 L, Type: Nonacid, Physical Form: Liquid