Thanks, I am thinking now that spidermites is more likely than the leafhopper. I'm not too worried about it; but it's good to get confirmation that it isn't anything noxious.
The soapy water, I already have some mixed up that I used on some aphids. Don't think I can do this with the mint though, as it gets clipped and the hung to dry by my cousin, so washing it is not likely and there would be soapy tea
I'm hoping that as the soil is improved and the watering becomes more consistent, they'll have less reason to be there. As I said, most leaves are not that affected.
