I have never used soft contact lens solution for hard contacts.But I guess, you are not recommended to do it.You'd better use the solution, your doctor recommended for. As I know that there are some contacts can only be used with a certain brand or type of solution.
Some hard contacts cannot used with soft contact lens solution because it's too abrasive and most soft contact lens solutions are not FDA approved for hard (GP) contacts. So you'd better consult your eye doctor because different types of contacts are used only in a specific solution.
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