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Which detergent cleans the best?    

A friend is working on a project for a science fair and presented her findings to us today.  She squirted 9 brand new white washcloths with mustard to make a stain and then washed 3 in Tide (a high priced brand), and 3 in Purex (a mid-priced brand0 and 3 in Shopper's Grocery Store brand (a low priced brand).  The picture below is a sample of one washcloth from each load.  Which do you think cleaned the best?  Which cleaned the worst?

                                             #1                                          #2                                            #3

#1 got the stain out the best but had a dingy look to the washcloth

#2 kept the washcloth the whitest and lessened the stain

#3 didn't do much to the stain and the washcloth looks very dingy

Which washcloth do you think was washed in Tide?

Which was washed in Purex?

Which was washed in Shopper's brand?

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