Something interesting I heard on one of sirvape's live vids. Is to be careful when using a brush to clean coils especially when cleaning higher gage wire as the brush can damage this wire. Especially with exotic coils like aliens etc where the outer wire is made of a extremely high gage. Think the interview was with @RiaanRed he said dry burning and waiting for the coils to cool (not red hot but still hot) and then rinse with cold water work's best for prolonged coil life.
Thank you for this @Friep