Vinegar to clean powerheads

I purchased a used reef tank and I am in the long process of cleaning it up - Question is if I fill it up with a 50/50 mixture of distilled vinegar and tap water and use my powerheads to circulate will the vinegar harm my new powerheads at all?

Nope, won't hurt them a bit.
 
Another option that's a little stronger than Vinegar is CLR. I think CLR has some surfactants in it so you want to be certain to rinse well but I find that it works much faster than vinegar and it's not as scary as working with muriatic acid.
 
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