Laptop general cleaning | Laptop fan cleaning | Laptop battery cleaning with isopropyl alchol

For laptop cleaning, use isopropyl alchol liquid(it's cost is less than 300), Pcb cleaning brush (cost around less than 300). You will get easily from amazon, see the rating and buy any brand.
Use cotton cloth for cleaning. Don't use wollen clothes.
You can clean your self few things like outer & inner part, fan, battery terminals. For this, No skills are required.
Be careful while cleaning. If you don't have confidence level, stop it.