If the computer disk D is full, the specific cleaning steps are as follows:

The materials to be prepared are: computer and 360 security guards.

1. First open 360 Security Guard and click "Computer Cleaning" in the main menu bar.

2. Then click to open "System Disk Slimming" in the pop-up window.

3. Then click and select the disk to clean in the pop-up window.

4. Then wait in the pop-up window, and click "Lose weight now" after scanning.