I've used dish soap and water and it worked pretty well. Thrips like to hang out at the bottom side of leaves towards the bottom of the plant.. so I used a towel and wiped down all the leaves. Do it in the morning or before night, it's when they are the most active and make sure you have good airflow to dry off the leaves. 1 thrip means there are probably some more, you could also spend some time and squish them yourself. I wouldn't go crazy using treatments now like you said, you will wind up doing more harm than good. Maybe get some lady bugs and hope they hang around.. probably too late for them to do anything, but could me a thought for next time. good luck! 👊