White marks or dark staining can appear on aluminium when water has been in contact with aluminium. If the water becomes trapped between wraps, sheets or other packaging material and there is no air flow to disperse the water a chemical reaction can happen called water staining. Water staining can present as white marks or dark staining. It can occur quite rapidly, so it is very important that you act immediately should you notice any moisture on or around your aluminium.
If you are unfortunate enough to have water staining on your aluminium, we recommend using scotch brite heavy duty scour pads with clean water as a means of removal.
Luckily, if staining has occurred, and the moist condition causing it is removed, the stain will not continue to develop.
For more information read our article, “How to prevent aluminium discolourisation”.