What is the best way to clean my ThinkPad’s LCD? What about the case? Can I just use Windex and a paper towel?

Windex, napkin, and paper towel are big no-no’s. Use a lint-free/micro-fiber cloth and screen cleaning fluid (which is a mix of water and Ethanol). Never spray the cleaner directly onto the screen, always spray it onto the cloth first. You can use the same cleaner for the case, or just a slightly watered cloth. These cleaning supplies are available at Office Depot, Staples and other office/computer supply stores.

Additional suggestions from members - use at your own risk:

apoll0:

To remove oily finger prints from the case, you can use the moist towelette from most restaurants/McDonald's/KFC's.

aceyx:

I prefer using Armor-All leather wipes. While I wouldn't go near my car with that crap, I find that it cleans rubberized surfaces without damaging the finish. YMMV.

AlphaKilo470:

Clorox Disenfecting Surface Wipes:
These work great for cleaning the case on a ThinkPad with the rubberized paintjob. Just be careful to blow all the loose dust off the case first. Also, keep the wipes away from the keyboard. Use compressed air for that, anything wet will simply cause the dust to go under the keyboard, which will eventually make things worse.

Clorox BRAND. That does not maen it has bleach in it

Just be careful when using. As anything that gets rubbed againt the paintjob would, if you press down too hard and rub too vigorously, you might screw things up worse. I wipe the surface with gentle to moderate force and I use them about once every two or so weeks.

as stupid as it seems i have been using soapy water on a microfibre cloth to clean televisions and tft type screens for years. just mix it in a spray bottle and put a light coating on the surface of the screen and wipe of straight away. there is also no smear marks

For LCD screens I use Glass Plus cleaner and a soft terry cloth rag. Glass Plus doesn't contain ammonia like Windex so it doesn't discolor plastics. Just spray on the cloth and wipe. It cleans without leaving film behind.

For sticky residue left behind from labels and stickers, I use Ronson Lighter Fluid. It safely removes the residue without marring the rubberized, vinyl or plastic surface.

For keyboards, I first vacuum the keyboard using the dust brush attachment which helps removes the debris that tends to accumulate down under. I then use Glass Plus sprayed onto a terry cloth rag to clean the keys.

If you wish to use a solution, commercial cleaning kits that include both a cloth and cleaning solution are available.

I do not use Windex (ammonia) because that can yellow the screen. I used just water for years, but a film built up.

For the last 6 months, I put a drop or two of "green" kitchen dishwashing soap (not Palmolive or like) into a well-laundered J-cloth (we keep them in the laundry room). I suds up the cloth, rinse most but not all of the soap out of. I wash the screen and the keyboard. I rinse the cloth until clear and wipe off the screen and then the keyboard. I now do my iPhone at the same time on the way by.

Zero streaks. Do it with the monitor off and black and all the final wipe of water to evaporate on its own. You will see a perfectly even screen.

.... JDH

Great tips. I guess because you don't wipe OFF the FINAL wipe, there are no directional marks/ smudge appearances.