I have always just been measuring concentrations on a nanodrop so never really thought about doing it on the spec. However at my current location I have to measure this in a spec. So my question is for you who have experience in this, how much cleaning between samples are needed? There is only two cuvettes accesable for RNA/DNA measurements. And what solution do you use for cleaning? EtOH? NaOH,Tris-, EDTA combi?