Purchase recognized contact cleaner, you can get two types, those that leave a lube residue (oily) or non-residue type.
The keyboard is mechanical meaning that each key has its own switch and the contact is happening in those switches independently. So dissasembling the keyboard wouldnt helpAre we referring to a computer keyboard?
Show us a photo of the keyboard.
PC keyboards are usually made with membrane switches on layered sheets of mylar. Disassemble the keyboard and carefully and gently wipe the sheets with a swab of IPA (isopropyl alcohol).
If it does not fix the problem then the only resort is to buy another keyboard.
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