Use 99% when you want a solvent. So why is 99% isopropyl alcohol (or even 91%) sold in drugstores? It’s for cleaning things when you don’t care about killing germs, but when you do care about ...

One thing to know about isopropyl alcohol and cleaning, however, is that less is more: While you can buy rubbing alcohol in 99% strength, you’re better off using a 70% concentration for most ...

Rubbing Alcohol . Rubbing alcohol (isopropyl alcohol) is the most commonly recommended, most practical (or, rather, least impractical), and least expensive alcohol to use on plants.