Lenovo IdeaPad U550 - Manual (Page 97)

Appendix B. Use and care information
83
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Cleaning your computer keyboard
1
Absorb some isopropyl rubbing alcohol on a soft, dust-free cloth.
2
Wipe each keytop surface with the cloth. Wipe the keys one by one; if
you wipe several keys at a time, the cloth may hook onto an adjacent
key and possibly damage it. Make sure that no liquid drips onto or
between the keys.
3
Allow to dry.
4
To remove any crumbs and dust from beneath the keys, you can use a
camera blower with a brush or cool air from a hair drier.
Note: Avoid spraying cleaner directly on the display or the keyboard.