Step 1: Launch MacMaster on Your Mac
Download FonePaw MacMaster and launch it. Check the system status and you are allowed to click certain feature, like System Junks, Photo Cache and more, to extract the unneeded files on your Mac.
Step 2: Preview the Data
Here takes Trash Bin item as an example. Hit Scan button to scan and when the scanning step finishes, you will directly view the results. Or hit "Rescan" to scan your iMac/MacBook again.
Step 3: Clean up Items
If you have chosen "Trash Bin" before, you will view the following screen which shows you the details. Move your mouse to the ideal data and select some of them. Finally, you can delete them with the "Clean" button. There is a magnifier logo next to the items' name, so you can click it to locate it.
Note: As for the other categories: "System Junks" and "Large & Old Files" etc., the process to erase them is the same to doing with "Trash Bin".
Step 4: Cleaning is Done
In several seconds, the unnecessary contents would fade away and there is a note occuring on the interface to tell you "Cleanup Completed". If you just removed part of the junks, it will inform you the size of the file that you deleted. You can firstly try the free Mac memory cleaner with 500 MB.