Should PCBs be rinsed after being cleaned with IPA?
IPA is pretty safe and non-corrosive. However, if you just let the board dry some flux residue will stay on the surface after IPA evaporates (since it was diluted in IPA during cleaning) making board surface sticky and less shiny. You can wash the board again in clean IPA, or water (use a dishwasher if you're using lead-free solder), or blow away IPA/dirt from the board with compressed air @70+ psi - that's what I do since it's the fastest way.