I am in the process of re-staining my log-sided cottage. The original stain was too orange, so we are applying a darker color. Most of the house looks fine, but there are several sections where the stain has a grey film. It is not dried out wood, but more of a film on the stain. Do you know why this happened, and most importantly, what I can do to remove the grey film?
It sounds like oxidation from UV damage. I would recommend stripping the entire house and starting over with a fresh surface. You should be using the same brand of stain if you are going to stain on top of the existing, but it probably will start peeling very shortly from what you are describing to me.