A cosmetic chemist explains AHA, BHA, PHA and LHA exfoliants and shares a real 7-day skin cycling schedule built around cleansing — not just retinol.
I Built a “Skin Cycling” Schedule — But for Cleansing, Not Retinol
If you’ve spent any time on #SkinTok, you’ve heard of skin cycling — the four-night rotation of exfoliation, retinoid, and recovery nights that blew up thanks to Dr. Whitney Bowe. What barely anyone talks about is that the same logic applies to cleansing, not just your active ingredients. Once I started treating my weekly cleanse like its own mini-cycle, my skin stopped lurching between “fine” and “freaking out.”
This is part two of my cleansing series — if you haven’t read the first post on choosing the right cleanser for your skin type, start there. This one goes one layer deeper: literally.
Quick answer: Deep cleansing (exfoliation) removes the dead skin cells your daily cleanser can’t. Most people only need it once or twice a week — more than that, and you risk damaging your skin barrier instead of helping it.
Why Deep Cleansing Exists (The Skin Cycle, Explained)
Your skin is constantly producing new cells and shedding old ones — a process called keratinization. For most people, this cycle takes anywhere from 28 to 40 days, though it varies person to person. When dead cells don’t shed properly, they sit on the surface, block new skin from surfacing cleanly, and create the perfect environment for clogged pores and bacteria.
That’s where deep cleansing comes in — it’s not a replacement for your daily cleanse, it’s a periodic boost that helps the natural shedding process along.
Should You Even Be Doing This?
My honest answer: it depends on your skin, not on what’s trending.
If you have sensitive skin, I’d actually recommend against regular deep cleansing. I’ve felt that sharp, stinging sensation firsthand — and when that happens, the right move is to stop immediately and focus on repairing your barrier before trying again. Once your skin has calmed down, you can slowly reintroduce it.
If your skin is dehydrated or your barrier feels compromised, skip the actives altogether and stick to a gentle water cleanse until things settle. There’s no badge of honor for pushing through irritation. If a product is hurting, that’s information — not a hurdle to tough out.
What Are You Actually Choosing Between?
Deep cleansing products generally fall into three categories:
Physical exfoliants — scrubs and particles that manually lift dead skin off the surface.
Enzyme exfoliants — proteins and enzymes (often derived from fruit or milk) that break down the “glue” holding dead skin cells together. Less familiar to most people, but genuinely gentle.
Chemical exfoliants — AHA, BHA, PHA, and LHA. This is the one that confuses everyone, so let’s actually break it down.
AHA vs. BHA vs. PHA vs. LHA: What’s the Real Difference?
All four share the “HA” (hydroxy acid) base — the difference is the letter in front, and it comes down to one thing: water-soluble vs. oil-soluble.
| AHA | BHA | PHA | LHA | |
|---|---|---|---|---|
| Solubility | Water-soluble | Oil-soluble | Water-soluble | Oil-soluble |
| Best for | Surface texture, dullness | Oily, congested pores | Sensitive, beginner skin | Oily, acne-prone |
Personally, I lean on chemical exfoliants over physical scrubs. Physical particles can be too aggressive depending on your skin, while a well-formulated chemical exfoliant has been gentler on my skin specifically. That said, “gentler for me” doesn’t mean “objectively better” — this is exactly the kind of claim you should test on your own skin rather than take on faith from any one source, including me.
My Actual Weekly Skin Cycling Schedule
Here’s the exact rotation I follow. This isn’t a universal prescription — it’s a working example you can copy and adjust:
| Mon | Tue | Wed | Thu | Fri | Sat | Sun |
|---|---|---|---|---|---|---|
| Milk | Foam | Milk | Deep Cleanse | Foam | Milk | Foam |
Deep cleansing lands once a week for me, generally 7–14 days apart depending on how my skin is behaving that week. If my skin feels irritated, I’ll drop the deep cleanse entirely that week, or push it back a few days. If I shaved that day, I’ll often pair it with deep cleansing since the skin’s already slightly more permeable.
On days I wear base makeup, I double cleanse — typically cleansing water or oil as the first step, since I rarely reach for milk as a first cleanser. Most days, though, I wear sunscreen rather than makeup, so a single cleanse in the evening covers it.
The Takeaway
Skin cycling isn’t really about the specific schedule — it’s about giving your skin planned rest instead of hitting it with the same intensity every single day. Whether you’re cycling retinoids or, like me, cycling your cleansing routine, the underlying principle is identical: push, then recover, then repeat.
Build a schedule, but treat it as a draft, not a contract. Your skin’s condition on any given day should always outrank the calendar.
Frequently Asked Questions
How often should you deep cleanse your face?
Once a week is enough for most skin types. Sensitive or compromised skin may only need it every two weeks, or not at all until the barrier recovers.
What’s the difference between AHA, BHA, PHA, and LHA?
AHA and PHA are water-soluble and work on the skin’s surface. BHA and LHA are oil-soluble and can penetrate deeper into pores, making them better suited for oily or congested skin.
Is deep cleansing necessary for everyone?
No. If your skin is sensitive, dehydrated, or currently irritated, skip it and focus on a gentle water-based cleanse until your barrier recovers.
Can I use skin cycling for cleansing instead of retinol?
Yes — the core idea (active days followed by recovery days) applies just as well to exfoliation and cleansing intensity as it does to retinoids.
Cleansing covered, deep cleansing covered — next up, I’ll be breaking down basic skincare products and how to actually layer them. Follow along on Instagram so you don’t miss it.