I have quite tough facial hair and I use those blades that cost stupid pounds each cos bics don' do it for me.
Sticking a new blade on every fortnight can become costly when you'e on a limited budget.
One day it dawned on me that it' not my stubble that' the main cause of premature bluntness,it's the soapy residue that remains on the blades after use,even after a good rinse.
For the past few months I've been giving the blade a splash of Flash Bathroom before and after shaving.
It' cheap and does a great job of keeping the blades clear of the stuff that dulls them so quickly.
My blades are lasting much longer for it.
Maybe of use to some of you?