Zainoed (z6, z2/zfx twice) the 2002 325i again after not doing it for two years. When I windexed the side windows, I got some windex on the black pillar between the windows and noted that the black got "stained" where the windex dripped. Interestingly, I never got this stain after the first Zainoing (z1 then z2). Stain came out when I reapplied Z2. As alcohol will strip z2, could it be that windex conatins alcohol, or is something different happening after z2/zfx as opposed to z1 then z2?
I used to use Invisble glass, which is good and can be found easily, but the Meguires NXT glass cleaner is much better. Use with a good quality MF towel and you windows will look incredible.
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