John McLean wrote:

Tesco's have their own dual blades.
I always clean the blades with an old tooth brush after use, to get rid of
the build up.

Oh I just use SWMBO's toothbrush^h^h^h^h^h^h^h^h^h^h^h^h^h^h^h Yes,
using an old brush is a good idea.

Actually that's one reason I've found for the branded blades being
better than the supermarket versions: the branded ones tend to have a
gap at the back, so water can flow through the gap between the blades
and wash out the bristles; however the cheapie ones are just moulded
into the plastic heads, so you can't get water flowing through the gap
and they clog.

Nobody's mentioned it, but there is a school of thought which says that
the whole "shaves you close then closer still" concept, with that little
cartoon of the blades cutting a bristle which we all remember, is just a
load of total marketing ********, and that none of them work any better
than a single blade. There was a thread (and link to somebody's
'research' website IIRC) on www.moneysavingexpert.com a couple of years
ago, but I can't find it now.

David