which laundry detergent cleans the best?

This can be based on everyone's own opinion but research has shown that hands down Tide is the #1 detergent.  Tide has several varieties they offer so choosing one is not that simple for beginners. There is Tide, Tide Liquid, Tide Powder, Tide Simple Pleasures, Tide Coldwater, Tide with Bleach, Tide HE, 2X Ultra Tide Liquid and several more. You can also get Tide in a variety of scents - clean breeze, mountain spring, tropical clean, meadows & rain, citrus & light, april fresh, glacier, etc. 

The second best is Gain.  This detergent is known to leave your clothes smelling like sunshine for weeks after washing.  Some of the scents you can buy Gain in is original, lavendar, island fresh, floral fusion, apple mango tango, fresh awakenings, citrus splash, Gain with febreze freshness Hawaiian Aloha, Gain with Bleach Alternative Outdoor Sunshine, Gain plus a touch of softness Simply Fresh, Gain with Oxy Booster Icy Fresh Fizz. 

And last for the best baby detergent is hands down is Dreft.  This is the one most recommended by Peditrician. 

Hello there. I  use two kinds of laundry detergent in my home. My number one is Tide, then next best is Gain.Tide Laundry Detergent works well as a pretreater, soaker, and laundry detergent for almost every laundry need. The new Tide Simple Pleasures Detergents also offer a variety of wonderful scents. Other Tide liquid laundry detergents comes with many different additives including fabric softener, color-safe bleach, and fabric refreshers. Tide laundry detergent also come in a dye and perfume free formula for those with sensitive skin, as well as powder. Although Tide is not the least expensive laundry detergent, it is one of the best at removing tough grease, grime, stains, and dirt.This detergent smells so wonderfully and works so well that it practically calls to you off the shelf. My husband, who usually only likes to buy the least expensive brand, loves Gain Joyful Expressions because it combines a wonderful detergent with a reasonable price. Try the Apple Mango Tango or the Gardenia Delight scents.