Cleaning some laptops is like heart surgery.
- I have just purchased a new Lenovo
- the extra $150 was worth it because the entire back comes off easily and exposes everything
- my Toshiba is a horror to clean -- keyboard out, screen out, RAM out,
- there is one laptop on the market where even the battery is not easily accessible

YouTube is worth a search for How to clean the fan etc, even narrowed down by manufacturer and model
- perseverance looking through the poor to mediocre YouTubes and then there is the occasional gem
eg. Cleaning my Toshiba c665:- https://www.youtube.com/watch?v=jlO5crblG64

If you use DuckDuckGo search engine in your browser by using a DDG "!bang" in the search box -- is a gift
eg, !utube cleaning toshiba laptop fan ... finds a lot of YouTubes