Any lingering smell of the unscented product can be easily mitigated by turning on a bathroom fan. Users also like that this drain cleaner doesn't have an exceptionally caustic fragrance. In the case of a persistent clog, you might have to apply the solution a second time, but at less than $10 a bottle, it's still a great value. For minor clogs and slow-flowing drains, the gel works in 15 to 30 minutes. Simply pour the formula down a backed-up sink or drain.

It's relatively quick to work, too - and doesn't require much manual labor on your part. 'It's a caustic cleaner, meaning it contains bleach and other corrosive ingredients that are especially tough on grease and soap scum,' says Dan DiClerico, director of the GH Institute's Home Improvement Lab. In our tests, we've been consistently impressed by the clearing power of this gel formulation, which is safe for all plumbing and septic systems. The storied product turns 100 years old this year, so our experts certainly know it well. Drano is the Q-tip of drain cleaners - the brand you probably think of first for tackling clogs.

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