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Once the sponge/cloth doesn't show any 'yellow' after a swipe, use plenty of clear water to rinse

You can also get an optional upgrade to the third stage that adds a carbon filter for removing VOCs and other gaseous pollutants, but this VOC filter also needs to be changed every three months

This a vintage Winston hat with an embroidered front graphic and small embroidered logo near the back snap

Though it doesnt have an automatic mode that increases the fan speed in response to increased particulate matter, its easy enough to bump up the speed manually if you experience smoke or an increase in particulate matter in the air