I had some spidermites I needed to kill. First I tried with soapy water but it didn't work. I then tried with some diluted neem oil. It burnt my plants. I sprayed it before lights out, and washed it off the next morning but it destroyed them anyways...
I'm seeing some new growth so I will keep them alive. But if it turns out to be a disaster I will most likely delete the diary and restart from the beginning....