Dry shampoo is a waterless cleanser that helps eliminate dirt, grease, and excess oil from hair without requiring a full wash and style. It is available in different types, including aerosol, spray, powder, and foam, and the specific type you use does make a difference. Here are some steps to apply dry shampoo correctly:

1. Shake the bottle: Give your bottle of dry shampoo a good shake before you use it. This will break up any clumps and give you more even distribution.

2. Prep and part: Before applying dry shampoo, part your hair into small sections. Start by parting through the oiliest section of your hair.

3. Apply to oily areas: When applying dry shampoo, only apply it to areas that are oily, not all over the entire scalp. The amount of product needed will depend not only on how oily your hair is but also on the type of dry shampoo you are using.

4. Massage into scalp: After applying the dry shampoo, let it sit for about 10 to 30 seconds, then massage it into your scalp. This will ensure it is well distributed and able to absorb oil more evenly.

5. Style as desired: Once you have applied and massaged the dry shampoo into your scalp, you can style your hair as desired.

It is worth noting that using too much dry shampoo or applying it too close to the scalp can lead to a powdery residue. Therefore, it is important to follow the instructions on the product package and apply the product correctly. Additionally, it is recommended to use a clarifying shampoo the next day to clear the scalp of any residue, dirt, and oil.