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Don't Buy laundry detergents can't clean everyday dirt from your clothes or keep whites and colours bright. So you'll find yourself washing your laundry twice or sighing over your once favourite jumper that's lost its vibrancy – both outcomes cost you money.

Every laundry detergent brand claims its products offer a thorough and hygienic clean, but we've exposed plenty over the years that have left us disappointed. 

Our stringent lab tests separate the Best Buy washing powders and laundry detergents from those you should avoid.  

Join Which? to find out which washing powders and laundry detergents we've named as Don't Buys.

We've tested laundry detergents from big-name brands such as Ariel and Persil, brands designed to be more eco-friendly, like Ecover and Method, and supermarket own brands. 

Head over to our full set of washing powder and laundry detergent test results to see all those we've tested and find out how much each wash will cost you.