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The whole point in using 95% or 99% isopropyl for cleaning electronics is that less water and other potentially conductive impurities get left behind when it dries. Yes 70% is better for general purpose cleaning and it will work on electronics in a pinch but when working with electronics you ideally want the highest concentration isopropyl alcohol that you can get.
I work for a company that manufactures electronics and all of our general product cleaning is done with 99% isopropyl. We will also clean some product with water but that uses highly filtered deionized water and what basically amounts to a fancy dishwasher with a conveyor running through it. That's also only really done when water soluble fluxes are used, otherwise it's just the alcohol for cleaning.