Entrepreneurs who make it onto a "Shark Tank" episode have the opportunity to introduce their company to a viewing audience of 7 million potential customers.

The companies that land a deal with one or more of the show's investors then have the chance to scale and, in some cases, become a nationally recognized brand.

We looked through old episodes and asked the Sharks themselves about their most successful deals. Read on to learn about the biggest "Shark Tank" success stories so far.

Scrub Daddy

A sponge company has far and away become the biggest "Shark Tank" success story. Over the past three years, Scrub Daddy has brought in a total of $75 million in revenue, according to investor Lori Greiner.

Greiner made a deal with its founder and CEO, Aaron Krause, in Season 4 for $200,000 in exchange for 20% equity. At that point, Krause had struggled to reach $100,000 in sales over 18 months, but Greiner saw great potential in the company's signature offering, a proprietary smiley-faced sponge that was more durable, hygienic, and effective than a traditional one.

She helped Krause expand his product line and brought them onto QVC and into stores like Bed, Bath & Beyond, where they have become bestsellers.