I use Megs OTC clay. I bought the CarPro 3 pack and used the finest grade and it marred up my car bad! It even marred up my window. Back to the Megs OTC clay for me. This clay seems to work but is also gentle on my paint. Last time I clayed before coating I barely had any contaminants with the clay. I do maintain the car well with strong acidic/alkaline washes, iron x, tar x etc. Our other car that lives outside is a different story and this car seems to have a bit more of a build up. Certainly nothing bad like I have seen, but a little bit.
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