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The claim. You might not be able to see it, but Andersen's 400 Series windows have a sunlight-activated, titanium-dioxide coating that the manufacturer says "reduces water spots up to 99 percent." It also promises "easier cleaning" of its outside glass.
The check. We decided to shed some light on the subject by comparing the 400 to its titanium-coating-less cousin, the Andersen 200 ...