IBM Thinkpad X30 Series Service And Troubleshooting Manual page 21

Caring for your ThinkPad computer
3. If the stain remains, moisten a soft, lint-free cloth with water or a 50-50
mixture of isopropyl alcohol and water that does not contain impurities.
4. Wring out as much of the liquid as you can.
5. Wipe the display again; do not let any liquid drip into the computer.
6. Be sure to dry the display before closing it.
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Chapter 1. Overview of your new ThinkPad computer