Kirkland Ultra Clean liquid cleans as well as Tide though I found it too concentrated and hard to rinse out. My favorite detergent from Costco is the All Plus Free & Clear liquid. It's an excellent all around detergent that is fabulous at cleaning and whitening. It rinses easily and doesn't leave residue like the Kirkland. They also make a regular scented version which smells divine. I've been using the All from Costco for about 6 months now. It's a great deal on sale for $10.99 for a huge 158 load bottle.

I prefer powder detergents so for me if I was shopping at Costco would be the tide powder. They make a bucket of powder detergent by Kirkland however it don’t contain any enzymes. For me that’s important. I hardly use liquid anymore but if I did all free and clear plus from Costco would be a good choice. My daughter has to use a free and clear and uses all free and clear from Costco or the powder free and clear from Walmart or persil sensitive.

Greeny what is in the ALL Plus that whitenens?

I believe the ingredient that contributes to whitening is an enzyme called catalase, facilitating a reaction in water converting a small amount into hydrogen peroxide. I have no evidence of this, it’s only a theory.

All I know for sure is my whites are blazing white. And I have not noticed any premature fading in my colors.

Larisa oranyone else, why do you prefer powders?

I tried the Kirkland powder in bucket once, and didn't like the way it performed on really dirty loads of DH's work clothes. Gave it to our technician and went back to Tide Original powder which I still buy at Costco now.

Costco used to have an amazing powder detergent that was in a red box not the bucket. Of course like most things I like it was discontinued :( the bucket of detergent don’t work well for my family and heavily soiled items. It’s because it contains no enzymes in that formula.