Clean the laptop screen gently?

Where do I find something good

Alk, in the form of e.g. Window cleaner and a paper towel are usually completely sufficient.

I take a microfibre cloth and alcohol from the pharmacy or this disinfection gel which is actually just alcohol

You do not need to buy it is enough a well-done rag and a dry cloth, then simply wipe with the cloth over the monitor and Vorichtig! Wipe off with the dry cloth