Can you use too much flux when soldering?

Can you elaborate on the potential consequences of using excessive flux during the soldering process? I've heard that too much flux can cause issues, but I'm not entirely sure what those issues might be. Could you explain in detail how excessive flux can affect the soldering job, the components involved, and any potential long-term consequences? Is there a recommended ratio or measurement to ensure the proper amount of flux is used? Your insights into this topic would be greatly appreciated.