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I'm a little confused on removing the residue when using M105. In one section you state not to remove it but in another section you said to remove it. I removed all residue from the car when using M105 the last time I polished my car before applying the M205.
If you are using M205, then by all means remove the M105. The reason, in this example, that I did not remove the residue is because I wanted to reuse it, so to speak.
M105 uses very fine (finishing polish fine) abrasives, just a lot of them. By switching to a clean finishing pad I was able to use the fine abrasives to 'jewel' the finish. I am not suggesting that everybody go out and do this, or that this is the proper procedure, only showing what is possible when you use newer technology products and think outside the box.