These are fairly simple to take care of. More damage is done but trying to clean them with the wrong agents. Never use firearm cleaning solutions on an air gun. The cleaning agents will eat away at the O-rings. Never use any oil. EXCEPT RWS, Gamo or Crosman Pellgun oil. These are made for airguns. See the link below for a suggestion.
I found an excellent video in air gun cleaning. See the link below
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