PCT is for getting your endogenous hormone production back into homeostasis. That is the purpose of PCT.PCT isn't for recomp. It's hard to get back into your body's natural state while continuing to add potent exogenous substances.
Some would argue that the use of clen during a pct period is positive as it can help to keep the fat off while maintaining an on cycle or slightly sub-cycle calorie intake. This would lend towards keeping a larger percentage of gains while your body is revamping it's test. I agree that using such a powerful substance during pct could be risky in regards to gains retention and reaching homeostasis, but as far as I can find, there is no known connection between B2-adrenoceptor agonist use and test levels. However, it has been shown (yes in mice and at huge doses, which may not carry over to humans) to extremely increase IGF-1 levels (110%) when coupled with calorie restriction, which is a factor in the purported extra nitrogen retention seen with B2 agonist use.(
*1) Obviously I'm not advocating for a calorie deficit in pct, but it's reasonable to say that a similar/maybe diminished result would come from a maintenance or surplus level of calories. Most arguments I've come across against clen in pct is a, "doesn't sound good" sort of thing, which holds little credit in my eyes, but if you have more to back it up I'd love to learn something new.
I personally stick with Albuterol for the lesser sides, but if someone is a clen die-hard, I think it's reasonable to say that using it at an appropriate dose during pct or shortly there after would most likely be beneficial in attaining the ultimate goal of more muscle and less fat.
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*1) jas . fass . org/content/76/4/1012.full.pdf
some other discussions on the subject with pro/anti arguments (just a google search):
bodybuildingdungeon . com/forums/steroids/37557-clen-pct.html
bodybuildingdungeon . com/forums/steroids/36344-clenbuterol-pct.html
thinksteroids . com/forum/steroid-forum/clenbuterols-affect-natural-testosterone-134236507.html