我应该如何清洁显示器上的这些淡黄色斑点？

I hate to be the bearer of bad news but unfortunately those spots are likely permanent.

Alcohol of any kind will damage the protective and/or anti-glare layers on the front of computer monitors. The alcohol in the hand sanitizer sitting on top of the keycaps has actually stripped away and chemically altered those coatings in the spots it touched. Unfortunately the only way to truly fix it would be to completely replace the display, which is likely complete overkill in your case.

If it doesn't bother you that much and it isn't worth the cost of a screen replacement to you, it's probably best to just live with it. Trying harder to remove the spots can only make the problem worse. At the very least it doesn't look to be that severe - sucks that an innocent mistake like that damaged your laptop when you were otherwise responsibly sanitizing things :/

Some other side notes for folks who find this down the line:

• Rubbing alcohol is safe to use on keyboards with a clean microfiber cloth, just make sure the liquid does not drip down under the keycaps and potentially damage the circuitry underneath
• 切勿在笔记本电脑的屏幕上使用酒精！可以用干净的超细纤维布擦水，但最好使用专用的屏幕清洁剂。我个人使用iFixit的品牌，但是Amazon上有很多替代品。