The neighbor has several dozen rose bushes in bloom with some very fragrant roses and thought of an idea to fill up a mason jar with petals and then fill up the jar with isopropyl alcohol and let it sit for a while. The problem I have is that all the isopropyl alcohols I've smelled have some sort of slightly offensive odor to them. Is there a way to the odor so that the alcohol is odorless? How about ash in a coffee filter? Distillation?