[Cynthia, Prescott, AZ]

Can't do much for current spots. They are pretty much permanent. But, you can prevent spots on future growths by growing the plants with better culture. That means, don't let the plant get colder than it should for its type, and particularly, don't let the leaves be wet when the temperature starts to drop. This means doing all of your watering and misting early in the day so the plant has a chance to dry its leaves before evening. For some Oncidium alliance plants, numerous fine spots are normal. You didn't put your location in your profile, or your growing set up, so I can't give you any more info than this.