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To see which glass cleaners really work, you have to make a mess. We took clean panes of glass and coated some with outdoor grime (mineral oil, clay, and a solvent) and others with indoor grime (those ingredients plus synthetic skin oil to simulate greasy finger marks). We subjected additional panes to repeated billows of tobacco smoke, letting them sit for three days to develop an amber film.
Then we tested the mettle of 10 cleaners, plus plain tap water and a home brew (see recipe), using a scrubbing machine to rub a sheet of cheesecloth plus cleaner back and forth over each pane. Three panelists judged cleaning, streaking, and any smearing that occurred when a tissue-wrapped finger drew a figure 8 on the glass.
Finally, we put drops of each cleaner on nine panels covered with old paint (three with flat paint, three with satin, three with semigloss), let the drops dry overnight, and checked for damage.
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What we found. All the cleaners, including our home brew and tap water, were very good or excellent overall. On indoor grime, Windex No Drip and Weiman excelled; ...