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Your right. As per my barbering textbook submersion time is anywhere between 1 and 20 minutes, manufacturers instructions reign supreme.

The mixing ratios for quats are 1:1000 or 1 1/4 oz. Of...

Never ever, ever,ever put your brush in barbacide or anything else that isn't metal or rubber and for that matter don't soak anything it either, I will have to check my reference book but anything...

In a barbershop it should be changed daily for home use maybe weekly.