>>1008929That looks like scale insects. Did you try rubbing alcohol on them with a cotton swab? It takes a long time to do but that might work.
Soapy water may just slide on their wax scale if it's not surfactant enough.
You can also try to buy green lacewing, hover-flies or Cryptolaemus montrouzieri eggs or larvas. The Cryptolaemus montrouzieri's larvas in particular are very active against scale insect.
