Switch off your laptop before starting the cleaning process. A dark screen also helps better see grime and dust.
Take a microfibre cloth and gently clean your screen and keyboard. Make sure you don't press too hard on the surface to avoid damage.
To blow away dust and crumbs from your keyboard, use compressed air cleaners.
For hard-to-reach areas, use a toothbrush or a cotton swab.
Mix half cup of distilled water with half cup of vinegar and add to a spray bottle to create a DIY cleaning solution for your laptop.
You can also use cleaning slime to properly clean your keyboard.
To make your job easy, you can also buy a cleaning kit for laptops that are readily available online or in repair shops. The kit has a small brush, microfibre cloth and cleaning solution.