JBL Suction cup with clip 12 mm
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This is a colonisation of harmless fungi which settle on the pieces of plastic. They will disappear on their own after a while.
Bacterial films (biofilms) on the inside of the pane are the most frequent cause of suction cups not holding properly. We therefore recommend you clean the glass panes with a cloth, such as JBL WishWash, before attaching the suction cups. _x000D_ _x000D_ Older suction cups generally lose their flexibility in the course of time. They should therefore be replaced at regular intervals.
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