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The Glue is alcohol based and it might be losing the alcohol as a result, the resin in the glue hardens , try mixing a bit of detergent or hair shampoo maybe it will work, as they have poly alcohols that do not evaporate
Stealing refuse energy , it's like garbage , do you steal garbage ??? its lost energy , reusing lost energy is like picking up pop cans , its a form of cleaning after polluters.... its NOT stealing , what made you think that ??