Why you considering Listerine ? CrestPro is used for cleaning, has completely different ingredients from listerine. However, CrestPro is reported to clean the mesh, not the gunkedup coil. It means, it can save you an atty which is not wicking due to old juice blocking the mesh, but does nothing to atty which has buildup on the coil - means low vapor production, less TH and so on...
Cleaning the coil comes always first, can´t imagine atty which have clean coil but mesh and airways is gunked... give a quick dryburn to the coil, its all it needs. My attys, they go through several dryburns during their lifespan, and rarely they took a bath of CrestProHealth. Mybe after 3 months of daily use
