Build up can be caused by either extended use or improper care, it is a layer of oily residue on the fleece, micro suede or even natural fabric lining of that nappy that will prevent it from pulling moisture away quickly. As a result the liquid rolls off the top of the fleece and causes a leak. Build up can be caused by using too much detergent, low quality/non-ecofriendly detergent, fabric softener, pure soap products, using nappy/barrier creams without a liner or even washing on cold frequently.
Build up often has the same characteristics of an improper fit, but it will continue to cause leaks regardless of how well the nappy is fitted. If you place a drop of water on the lining of the nappy it will roll around on top and won't go through into the insert/inner. If you think your nappy may have build up check out our care info for instructions on removing it and tips on preventing it from returning.
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