HP Photosmart C4340 All-in-One Série Guide D'utilisation page 39

Chapter 3
3. Dry the backing with a dry, soft, lint-free cloth.
CAUTION:
4. If further cleaning is needed, repeat the previous steps using isopropyl (rubbing)
alcohol, and wipe the backing thoroughly with a damp cloth to remove any residual
alcohol.
CAUTION:
as this might damage it.
5. Plug in the power cord, and then turn on the product.
36 HP Photosmart C4340 All-in-One series
Do not use paper-based wipes, as these might scratch the backing.
Be careful not to spill alcohol on the glass or exterior of the product,