Isopropanol is 1% water so when the alcohol is gone there still is the same problem. I use alcohol for cleaning, same as acetone, I would not use alcohol in any area confined especially with springs. To get moisture from those areas I use heat, and a lube that once the moisture is cooked off it will seal the metal. As long as the heat does not go so far as to change temper on springs, and the metal needs to be heated to changing colors to do that, it is safe. Water turns to gas at a safe level to immerse wet parts into cooking oil, preferably old. Water gone, metal pores absorb oil, parts come out slick as snot. Unless I am trying to patina a BP handgun, once cleaned with hot soapy water and dried off the parts go into old cooking oil, at around 250.
The reason for old cooking oil is the oil has carbon from food and that carbon ends up in the pores of the steel. But then that is my theory, I have no way to prove it.
