Failing to address tough, embedded contaminants dooms your paint to a dull and gloomy future. Fight the funk! Impurities like pollen fallout, tree sap, water spots, bug jerky and road grime, wreak havoc on your paint finish because they can build up and create a layer of deposits that defy normal washing. These entrenched deposits must be removed because polishing your paint will only grind them further into your finish, causing swirl marks and blemishes. Wax does not adhere well to contaminated paint and waxing over the deposits only protects them, and makes achieving paint perfection all the more difficult.
This is a companion discussion topic for the original entry at https://www.hagerty.com/articles-videos/articles/2016/07/20/surface-prep-mitts