I deep clean my brushes after every single use except for my brow brush. I must wash that thing like twice a month. I was surprised to find I'm in the minority on that cleaning habit and it's not like I'm a super clean freak. My issue with the beauty blender is just the look of it and the way it's used. I prefer a traditional brush, the handle. I don't have time to drag or dab a sponge on my face. Might as well break off a piece of my bath sponge and save the money.
What do you classify as deep cleaning Shontay? Are you talking about washing/conditioning and laying flat to dry?
If I did that every single time I'd never be able to use my brushes. They'd always be wet.
I deep clean my kit brushes after any professional job (and they just sit clean until the next gig) , and I deep clean my personal brushes (my everyday babies) about twice a month. Otherwise, they get hit with Parian Spirit spray... scrubbed out on cloth-like paper towel, and put away. They live in mesh bags, so air naturally passes through them for drying time.
Makeup doesn't actually get deep enough into bristles during initial use for deep cleaning every single time. Most powders are on the 'surface' of the bristles. Even cream products are typically on the 'tips' of the brushes, and can easily be cleaned away with brush spray. Now if you're talking foundation brushes, Parian Spirit takes care of that too (they have this fantastic little pot that gets all the muck out). You'd have to use (and embed) a ton of product to warrant deep cleaning every single time.
Plus all that moisture on the ferrule on a regular basis compromises the brush construction.