Can a Bonsai Fig with Soft Trunk Be Saved?

A 4-year-old bonsai fig (Ficus) on a bathroom sink drops all leaves; trunk becomes soft and withered, with white mold on soil and trunk. Owner tried pruning, drying, and cleaning mold. Expert Will Creed delivers hard news: soft trunks mean roots have rotted beyond recovery. The cause: insufficient light (bathroom diffused light) and soil not drying between waterings. Figs need direct sun on a sunny windowsill. If caught earlier, it might have been saved, but now it's too late.