Test a sacrificial plant first.  I have seen significant tissue damage when I sprayed sensitive plants with ethyl alcohol, but I routinely use 70% isopropyl alcohol with no problems.
Oh my do I second this!  Be especially careful using ethyl alcohol on bulbs: from my experience it hurts 1000x more than it helps. Haven't tried isopropyl at all because I was too traumatized by my ethyl experiences, so can't speak to that.