yellow in the first place
A lot of folks assume yellow plastic means the fan is ruined, but that is not always true. In my experience, fan blades usually turn yellow from a combination of kitchen grease, dust, nicotine exposure, sunlight, and plain old oxidation. If the fan has sat near a stove, in a garage, or in a sunny window for 2 to 5 summers, the plastic can pick up a yellow cast even if it still works perfectly.
There are really two different problems that look similar. One
