Using the same dish soap every time you wash dishes is generally acceptable and won't cause any harm. Dish soaps are specifically formulated for cleaning dishes and cutlery, and they are designed to be safe and effective for regular use.
However, there may be a few reasons why some people prefer to switch dish soaps occasionally:
Effectiveness against specific types of dirt: Different dish soaps may have varying formulations or ingredients that make them more effective against certain types of stains or residues. For example, some dish soaps may be better at cutting through grease, while others may be more effective at removing dried-on food particles. By using different dish soaps from time to time, you can ensure thorough cleaning for a variety of dishes and situations.
Fragrance and scent preferences: Dish soaps often come in a variety of fragrances and scents. Some people may prefer to switch between different scents to add variety or cater to their personal preferences. However, this is purely a matter of personal preference and not a requirement for cleanliness.
Avoiding product buildup: Over time, certain dish soaps can leave behind a residue or buildup on dishes or in the dishwasher. This can be more noticeable in areas with hard water. Switching to a different dish soap occasionally can help prevent excessive buildup and keep your dishes and dishwasher clean.
While it's generally fine to use the same dish soap consistently, it's worth considering these factors if you notice any issues with cleanliness, fragrance, or residue. Ultimately, choose a dish soap that you trust and find effective for your specific needs and preferences.