Take the plant out of the potter.
Fill a large container (a storage tub/bin , garbage can, 5 gallon bucket etc.
Fill it with dish soap and warm water. Dunk it, roots and all, scrounge around the leaves really good, then rinse with a hose do this a few times. Wash away some of the outside dirt on the root ball. check it for any possible soil dwelling pests. Re pot in your preferred soil and new container and good to go.
The plant may show signs of shock for a day or two, if at all, but then will perk back up.
The only way you can usually kill something is if your don't re-pot it.
This method isn't for chameleons, but it will get rid of most leaf dwelling bugs, and you should beable to examine the roots for pests. The final rinse should make it chameleon safe.