I planted sweet majoram and may have mistakenly watered the leaves.
How do I fix? Spray mildly soapy water?
Here's a picture
Do nothing. Soapy water is used by some people for pest but not for physical damage like this. It will do nothing good and it could even do more damage. You cannot reverse physical damage. The spots on the leaves won't hurt the plant and new foliage is already growing. Your plant is putting up flower stems which you may or may not wish to cut off and use in the kitchen.