My phone screen is some whitish stain how to I fix my phone

If your Vivo Y20 phone screen has developed a whitish stain, here are a few steps you can try to fix it:

1. **Clean the Screen:**

- Use a soft, lint-free cloth (like a microfiber cloth) to gently wipe the screen.

- If the stain persists, dampen the cloth slightly with water or a screen cleaning solution made specifically for electronics.

2. **Avoid Harsh Chemicals:**

- Don't use harsh chemicals or cleaning agents, as they can damage the screen.

3. **Restart Your Phone:**

- Sometimes, a simple restart can resolve minor display issues.

4. **Check for Software Updates:**

- Make sure your phone's software is up to date. Updates can sometimes fix bugs related to the display.

5. **Factory Reset:**

- If the issue persists after trying the above steps, consider performing a factory reset. This will erase all data on your phone, so make sure to back up your important files first.

6. **Professional Repair:**

- If none of the above steps work, it's possible that there's a hardware issue with the screen. In this case, it's best to take your phone to a certified repair technician for further diagnosis and repair.

Try these steps in order, and hopefully, your screen issue will be resolved.