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Message: <blockquote data-quote="riverside" data-source="post: 159264" data-attributes="member: 14054">It could be your problem if you put the fluid directly on the lens and then used a cloth or whatever to do the cleaning. Fluid can then be forced into the lens body itself during the wiping process, especially any lens not manufactured as weather resistant. Rule of thumb is cleaning solution on cloth then wipe clean. Another possibility is the fact that plastic contracts when subjected to heat and that could have happened to your lens, allowing any excess cleaning fluid to enter the lens.</blockquote>