My main vape is a strong, caustic, tank cracking, coil eating blend of Mtbakers cinnamon roll, home made menthol and ECblends 5x Atomic Cinnamon Fireball, I am using protank 1 & 2 atomizers for this and I must clean the coils after every tank of face extremely short head life.
Being so aggressive, If I desired changing flavors I would have to get a brand new head unit as the above mix just flat out will not come out for anything less than a long soak in vodka followed by a rinse under the tap with scalding hot water. I would also have to thoroughly clean the rest of the unit so I would probably use a PT2.
My normal cleaning for tank and coils is pretty simple, I take everything apart and put the parts in a small ramekin, a coffee cup will do...
I then place the ramekin in the kitchen sink making sure I am using the side with the strainer basket and that it is in and run hot water into it for a couple of minutes. If it starts cold that is fine, If I have dishes to rinse, that is fine too.
Let sit for a while, then drain water off and let sit overnight to air dry.