@mystlw
What a beautiful photo. I want those spiders in my garden...lots of those.
I don't think a soap wash will do a thing to deter leaf miners.
I was just reading about using sticky traps for them, I am considering making my own. Pulling leaves might be an option when they are only a few damaged, but in my garden that would be too large of a task. I often see it recommended to pull leaves, for leaf miners, to pull leaves for leaf streak and for rust. So as I've said before that would leave no leaves on the plants here.
I deal with all those problems here, and as depressing and challenging as it is, it is the critter damage that really gets to me.