Your primary detergent (liquid, powder, or tabs). This is the "star of the show" where most of the cleaning power originates.
Do not exceed the "MAX" line, as this can cause the softener to siphon out too early. Essential Laundry Tips
The video title most likely refers to the standard numbered compartments found in a washing machine's detergent drawer. While modern machine labels can vary, the following guide explains the universal purpose of slots labeled 1, 2, and 3 . Washing Machine Drawer Guide
If you have a top-loader without a dispenser, place your detergent at the bottom before adding clothes to help it distribute faster.
Use this only for heavily soiled or stained clothing.
Always check garment care labels to ensure you are using the correct temperature and cycle speed to avoid shrinking or ruining the fabric.
Excessive suds often mean you've used too much detergent, which can actually leave clothes less clean and potentially damage the machine.