In article ,
"Marco Leon" mmleon(at)yahoo.com wrote:

It happened during the wash so I don't think it was the wax. From what I
gleaned from past Google searches, folks regularly talk about removing
oxidation to get to the original layer of paint in order to make it look
shiny again. What does this "removal" entail and what would it look like? Is
it the same color as the paint?

The oxidized layer of the paint is what you are removing, along with old
wax and dirt. Even polyurethanes will oxidize, to some extent --
especially if exposed to the UV rays of sunlight and moisture, such as
occurs with dew. Hangaring the plane eliminates a lot of those exposure
problems.