Shield mould is a common but annoying problem in Baldur’s Gate 3. It can be difficult to get rid of and can quickly spread to other items in your inventory. To prevent the spread of shield mould in your inventory, keep your shields protected and avoid storing them with other items. You can also use the “Clean” action to remove mould from shields.

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If your shield is already infected with mould, you can use the “Clean” action to remove it. However, if the mould has spread to other items in your inventory, you may need to take more drastic measures. One option is to use the “Destroy” action on the infected items. This will remove them from your inventory permanently, but it will also destroy any valuable items, so be careful when using this option. Alternatively, you can try to sell the infected items to a merchant. However, be aware that merchants will often charge a reduced price for items that are damaged or infected.