Putty rubbers

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How long do yours last? Mine is two years and going well although its filthy. It cleans okay and leaves no marks.. But I do sometimes think I ought to buy a new one. Maybe it leaves no marks I see any more...
They do indeed get filthy, especially if you use them for soft pencils, carbon pencils or charcoal. When you asked 'how long do yours last?' I looked around for mine: and discovered that it fell to bits some while ago, and I've been using bits of blue-tack instead.... So adding to my list of wants - that's oil varnish, Linseed oil, putty rubber..... oh, and a harder conté crayon; Jacksons or Ken Bromley, I'm on my way.
I must admit I often have two on the go. I pull pieces off them and knead it into points to rub out in a specific area. Plus they are great for drawing with a piece of cartridge paper covered with charcoal and just draw. I do remember using white bread in place of one. But I also buy new ones very frequently .
I used to use them all the time but nowadays I use ordinary rubbers - as long as I am gentle with them they work perfectly for me and - unlike putty rubbers - they stay clean.
I have had good putty rubbers and bad putty rubbers. Some white ones have leaked oil - disaster! So I now stick to blue ones, which maybe bBuetack. But Bluetack now seems to be pink!
Im still with the old one...maybe you're getting stronger!
Just had another putty rubber disaster!  As I couldn't find my old tried and tested blue putty rubber, I thought I would try out my new white putty rubber by Windsor & Newton.  It refused to knead.  Then it started disintegrating.  I tried tapping the paper to get off the bits and resorted to a light squirrel brush, but ended up blurring all of the charcoal drawing! If only I could remember where I got my blue one from or what make it was.  Can any one recommend a good one?

Edited
by Linda Wilson

Blu-Tac does it for me. It might not be the best solution but I get far better results with it than using putty erasers which, frankly, don't 
Must be something different in the white W&N the one I bought did the same had it replaced and the same happened. Went to a different art shop and got a new larger blue one it works fine.
The blue ones are more kneadable and less likely to fray and drop bits all over the place - they're softer, and more malleable; the white ones can be pulled to a point and used as a drawing implement.... but I don't like 'em!  I tend to use blu-tak as well, or one of those erasers in a battery-driven pen (which require some getting used to). I haven't bought a putty rubber for a while now but seem to remember Jacksons having the blue ones.
Thanks Alan, Dixie and Robert.  I knew you would have all the answers.