If there are traces of soot left, i use grits, pour it into a bong and shake it slightly. Acrylic devices require more careful handling. I also like to use steamroller pipes because they are much easier to clean and leave no smell when cleaned properly. So I often carry it with me to smoke somewhere in nature and not take a Bong for this. It has many advantages which you can read about in the article here https://urbanaroma.com/what-is-a-steamroller-pipe/ and decide for yourself whether it suits you.