Bio vs non-bio washing powder

Every year, we put bio and non-bio washing powders, liquid/gel detergents and liquid capsules through rigorous tests to separate the best products on the market from those you should avoid.

The results might surprise you. The most expensive products aren't always the best performers, so our results tell you which products give you the best results, but also the detergents that save you money.

We've been testing washing powder for 50 years, so we can advise which detergents are best for your wash, depending on stains, colours and whether you prefer bio or non-bio.

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What's the difference between bio and non-bio washing powders?

Biological washing powders, liquids and capsules differ from non-biological versions both in their ingredients and in how they remove stains. 

Many people think non-biological washing-powder is kinder to sensitive skin than biological detergents, but is that belief backed up by scientific research?

We can reveal the differences between bio and non-bio washing powder, and what this means for your laundry. 

Which? members can log in to reveal the results of our research. Not yet a member? Join Which? to get instant access to this and all our reviews. 

Discover the best washing powders and laundry detergents we've tested.