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 ...

The best type of rubbing alcohol to use is one with a 70% concentration, according to Liakopoulos, because 90% and 99% concentrations have less water in them.

Computers are a nightmare for gathering dust, but using a 70% rubbing alcohol and a soft cloth (such as a microfibre cleaning cloth, £4.99 on Amazon), you can easily wipe dust away from your ...