1. Neutral laundry detergent is a detergent with a pH value of around 7. Then the simplest way is to use pH test paper to test. If the color of the paper strip is consistent with 7 on the color plate, or between 6 and 8, it can be considered neutral.

2. Hope: Products with high-quality appearance will have no impurities or layers to the naked eye; while defective products will have layers that are thick at the bottom and thin at the top. At the same time, neutral laundry detergents with good color are stable in color and will not discolor after being left for a long time; poorer ones will have dispersion and fading. When purchasing, pay attention to the label. A good neutral laundry detergent package should have the product name, net weight, product instructions, factory name and address, shelf life, etc. In addition, the trademark pattern on the product label should be clear and there should be no deinking.

3. Smell: A good neutral laundry detergent has a pure and long-lasting fragrance; a bad neutral laundry detergent will be sour and a little astringent.

4. Cut: A good neutral laundry detergent has moderate viscosity and uniform ingredients when touched by hand, while a poor laundry detergent feels extremely sticky or thin, with sediment at the bottom.