Difference between mani and mazi

For a long time now I have found it difficult to distinguish between the features of mazi and mani. I noticed that my everyday discharge has a smell to it, like the smell of mani. So when I do get mazi I feel it could be mani, but I'm always unsure. This is because it looks thin and white on my clothes, but after wiping, its majority white but looks a little yellow toward the end. The discharge is mostly thin and white, but the last part looks a little yellow.

1. Is ghusl fardh upon me every time I see the discharge look like this?

2. Every time I see, what looks like mazi to me, always has the same smell as mani, but so does my everyday discharge. I'm kind of confused?