i've just experienced the same issue, but way more severe than yours. Some guy i was chatting to on the net said to use neem oil, so i got myself 50ml of neem oil and mixed it with 500ml of water, no detergent was added. Anyway i sprayed it all over my 1.5meter plant, and every single leaf on my baby has fried, literally fried, they are crispy, and have fallen off one by one. i washed it all down using a soap mixture, and gave it a shower with plain water, let's see if it can be revived. this was three days ago, no new leaves have appeared yet.