You are exactly right. I tried the acid and it did little cleaning that I could see. Then I went over it with a buffer with some agressive polish and that made it look like a mirror.Acid based cleaners will definitely help, but to do your work justice you're gonna have to buff it too. The acid will "put a dent" in it but won't totally eliminate the blotchyness.
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Let me ask you this.
Do I need to use the acid before I buff it or can I just buff it? It seems like the area I used the acid on buffed out a lot quicker but I only buffed a small spot is far. I need to run and get some more polish.