Here are a few steps you can take to reduce or eliminate background noise in your car stereo:

1. Check your connections: Loose or faulty connections can cause static and other background noise in your car stereo system. Check that all cables and wires are securely connected, and replace any that are frayed or damaged.

2. Move your mobile devices away: Cell phones, tablets, and other mobile devices can cause interference in your car stereo system. Try moving these devices farther away from the stereo, or turn them off when you're listening to music.

3. Adjust your EQ settings: Try adjusting the equalizer (EQ) settings on your car stereo to reduce the levels of certain frequencies that might be causing background noise. Experiment with different settings to find the best sound quality.

4. Use a noise filter: If you're still experiencing background noise, consider installing a noise filter or ground loop isolator in your car stereo system. These filters can help remove unwanted sounds and improve the overall quality of your music.

5. Consider upgrading your car stereo: If none of these solutions work, it might be time to upgrade your car stereo system. A newer, higher-quality stereo may be better equipped to handle background noise and deliver clearer sound.

By taking these steps, you can reduce or eliminate background noise in your car stereo system and enjoy your music to the fullest.