If you use your Mac to back up your iPhone or iPad, you can delete old backups.
Also choose Mailbox > Erase Deleted Items.
If you use the Mail app for your email, choose Mailbox > Erase Junk Mail from the menu bar in Mail.
Delete files in your Downloads folder. Open this folder from the Dock, or by choosing Go > Downloads from the menu bar in the Finder.
Delete music, movies, podcasts, or other media, especially if it's media that you can stream or download again as needed.
You can also delete files that you no longer need. Some MacBook models also have a couple of small clips that hold the cover in place from the center, but you can carefully just pry up the cover to unclip it.If you have another storage device, such as an external drive connected to your Mac, you can move files to that device. Media files such as photos and videos can use a lot of storage space, so you can take steps such as these: Once you have all the screws removed, you can lift up the bottom cover from the back. Keep track of each screw and where it goes, because some of them are different lengths. Take your P5 pentalobe screwdriver and remove the screws around the perimeter of your MacBook. Flip over your MacBook so that the bottom is face up. This step is pretty much the same for any modern MacBook, except for the newer Touch Bar models (more on that below).
Organization and Patience: You’ll want to keep track of screws and take your time with something like this.
Cotton Swabs: Great for removing or loosening up stubborn particles of dust and/or dirt.
Compressed/Canned Air: An easy way to get rid of most of the dust.
Guitar Picks: Needed if you have a 2016 MacBook or newer.
Suction Cup: Needed if you have a 2016 MacBook or newer.
If you don’t already have one, it’s best to buy a kit that includes a P5 bit.
P5 Pentalobe Screwdriver: Most MacBooks use P5 screws.
You’ll need a few things before you get started, some of which you may already have.