Have you noticed that your nappies have a strong smell when they are wet? The reason for this is very likely to be down to detergent build-up. Detergent and mineral build-up can trap bacteria, causing stink and rashes and might also be affecting the absorbency of your inserts. The issue might become apparent when your baby is teething and their wee starts smelling stronger especially at nighttime when they are in the same nappy for longer. In these cases, we recommend that you do a strip wash.