Lift the plant off the stand or dish and discard any standing water. Set the pot onto a newspaper or a paper towel and gently press down on the soil to remove the excess, infected water.
Remove the plant from the existing pot and examine the roots. If the smell of decay is overwhelming, throw the plant away. If there is minimal root rot and damage, gently rinse the root ball with cool water and trim away the affected roots with pruning shears.
Clean the affected pot by submerging it in a mixture of 1 part chlorine bleach and 9 parts water. According to the University of Minnesota Extension, this is adequate to protect the plant from reinfection. Rinse the pot well under cool tap water to remove any bleach residue.
Wipe down the pot and fill it with new, well-draining soil. Do not reuse the infected soil. Repot the plant and water it according to its own unique needs.