The terms are largely used interchangeably. Some brands use "cleanser" as a broader term that covers different textures and formats, while "face wash" is sometimes used for products intended for washing the face. There is no strict universal distinction, so check the individual product's texture, formulation, and description.

It depends on the individual product and your routine. If the product directions allow for use at both times, the same face wash can be used in the morning and evening. Different products may also be appropriate at different times depending on what your skin needs and what you are removing.

Start with what matters most to you, whether that's a specific skin concern, an ingredient you want to include, or a texture preference, then narrow down from there. If your current face wash leaves your skin feeling tight, oily, or uneven, that's a useful signal for what to try next.

Not necessarily. Double cleansing can be useful in the evening when you've worn makeup or sunscreen and want to use a first cleansing step before your regular face wash. Whether you need it depends on your routine and the products you're using.