“Denatured” alcohol is just alcohol with undrinkable junk in it. Electronics grade alcohol doesn’t need to be denatured, you need at least 99.5% purity instead (i.e. 0.5% or less water).

If you can’t find it whatsoever, you can make it at home, from 96% (azeotropic) alcohol. Just add quicklime and let it soak that humidity. Warning: the reaction produces heat and alcohol is highly flammable, so only add a tiny bit of quicklime each time.

Source: I’ve worked in a lab owned by cheap fucks who expected us to conduct organic chemistry reactions with 96% alcohol. Had to improvise.