Olbas Oil 20ml Decongestant Olbas Oil – just a few drops in a handkerchief is all it takes to help unblock blocked noses. Benefits of Olbas Oil Powerful natural decongestant vapours Olbas Inhaler is a handy way to get relief from a blocked nose, any time. May be used as a massage oil to soothe away muscle ache. Olbas Oil is suitable for adults and children from 5 years of age. How to use Olbas OIl Just a few drops on a handkerchief is all it takes to help unblock even the stuffiest blocked nose, thanks to Olbas . For night time relief and to aid a restful sleep – tuck the hanky into your pillowcase at night. Always read the label.