Remove the orchid from its planting container and discard the used orchid potting mix. Wash the planting container in a solution of warm water and mild liquid antibacterial dish soap and dry with a soft cloth.
Hold the roots of the orchid under room temperature, gently running water to rinse off any remaining potting mix.
Examine the root of your orchid carefully; healthy roots are stiff and turgid while rotting roots are brown, mushy and foul-smelling. Use a pair of sharpened and sterilized pruning shears or a gardening knife to carefully trim the rotting roots from your orchid's root system.
Re-pot the orchid using fresh orchid potting mix. Combine equal parts redwood bark, charcoal, peat moss, volcanic stone and chopped tree fern fiber to create your own well-draining orchid potting mix, if desired.