Yah I didn't notice much of a difference at 24 hours either. Some bits of it will continue to die for a couple of days after you do the water change too.
I did a second dose at the 48 hour mark (after a 20% water change), but chickened out after a day, so my second dose was really only 24 hours long. No lasting effect.
And yes, for some reason cyano seems to love growing on plastic. The first place in my tank it ever appeared was on the plastic covering of one of my overflow boxes, it climbed up it like a slow moving flame. Then later I couldn't keep it off my acrylic frag rack to save my life.
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