White spots on a rubber plant can be caused by various factors such as fungal infections, pests like mealybugs, or mineral deposits from hard water. To treat them effectively, you can wipe the leaves with a damp cloth to remove pests, use a fungicide for fungal infections, or water the plant with distilled water to prevent mineral buildup. Regularly inspecting the plant and maintaining proper care can help prevent white spots from reoccurring.
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