Trimming brown roots and fungicides

[brsword]

In trimming the roots of orchids it is obvious that one would cut off the rotten ones. But what about ones that are just slightly brown. Cut those too or will they recover if treated with a spray-on fungicide or a systemic fungicide. Or should they be re-potted allowed to dry out and not chemically treated at all. Ah! the life and trials of orchid growing, but it is great when it works.

Thanks