Long Life Glaziers Putty - very old but unopened (Malvern Link WR14)

Let's you clean the outside and inside at the same time, particularly useful if the outsides of your windows are difficult to get to. BUT the magnets aren't strong enough to hold it properly through my double glazing, so for single glazed windows only. The bits of sponge might want replacing (they can just be pulled out with a slight wiggle and another lump of sponge put in) but the wipers are still nice and flexible.