How long do these bottles last? On the back it says that if you keep ZFX enhanced zaino in there for more than 12 hours, you should trow away the bottle. I don't get that. I could understand throwing away the unused zaino inside. "After 12 hours, it is not possible to completely remote the ZFX from the mixing bottles." As long as I am using ZFX all the time, who cares... right?

 

I've forgotten to clean out the bottles many times. I just poor in rubbing alcohol in them and let them soak. They will come clean.

 

I figure Sal @ Zaino has a reason for suggestion that. I have never had excess Z5 or Z2, with or without ZFX. Always mix less than 1 ounce. Somewhere between 1/2 and 3/4 ounce. Then I rinse the bottlesand applicator, followed by a soaking in heavy solution of Dawn. Been using the same bottles since mid August.

 

I have so many of the darn things, I don't usually have to clean them out. I reuse the ones without ZFX but I always wash them right away when I use the ZFX. I don't know if it is necessary or not, I just do it.