Lenovo Leigon sounds terrible. How to best clean fans?

I've been using this laptop since 2018 and it's fighting for its life a lot of the time. I can see lots of crumbs and dust in the fans...

Do I need to take it apart? I have canned air but I feel like I'd just be pushing everything deeper into the computer.

I'm just scared to touch it at all. I feel like it's about to explode, hence the backing up of my gaming folders.