The same here. I was on paleo diet, vegan diet for long time and than, one day, I ate a thousand of sweets during the week and my acne is gone.

actually, as you know, it should be just the opposite. I think it was the higher air, less germs maybe, you were
fortunate. maybe it will continue. good luck

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I have a solid routine of cleaning twice a day (cetaphil) and moisturizing (cetaphil) and toner (rosewater) and then sunscreen ( neutrogena ). I STOPPED all of this to go on vacation in Mammoth, CA, and had NO ACNE for 4 days! I had little to water, did not clean my face with anything more than cold water,

well there is a few things ive read about, which might help..

firstly ditching all soaps/creams and using only water is very similar to the caveman regimen, which a lot of people find helpful. unfortunately alot of soaps/creams are bad for people with acne.

you could be suffering from diet problems and your trip helped you avoid something which causes you problems? -for eg if your sensitive to milk avoiding it may of helped. milk causes hormone problems and apparently stays in the body for 2-4days.

lack of time in front of the mirror may have helped as you couldn't pick or fuss over your skin(?)

bad tap water(?) there is some talk but not much proof that some "hard" tap water is to blame for skin problems(?) - so avoiding it for a few days helped clear you up?

..or you could lining yourself up for a bad reaction. in my experience what you eat /drink today will "show up" in 2days time.

I don't buy the whole, acne is caused by sugar thing...I had been eating a ketogenic diet for a few years when I started getting acne. I wasn't eating ANY sugary foods EVER. It wasn't possible for me to eat fewer carbs than I was eating.
If you look up the studies, people who eat higher carb/sugar diets have LESS acne, not more.
As far as those products listed... every single thing mentioned is chock FULL of comedogenic ingredients and I would look like a walking pizza if I used that routine for one day. Use "cosdna.com" to find better products.

Something that a lot of vegans fall into is eating a LOT of soy. Eat vegan, but avoid the soy.
I found that eating grapefruit really helps mine. I can't take zinc at all, it makes me break out instantly, but this could be because its triggering an excess copper dump...or it could be that it's pushing my high T levels higher and converting more excess T into more androgens. (Zinc is actually an aromatase inhibitor.) The sugar, zinc and other aromatase inhibitors do not help my acne. I had my hormones tested and my T is high and my E is low. Aromatase inhibitors will make that imbalance worse along with my acne.