Several of my shaving creams have been sitting (and used from) in my bathroom for about 1 ½ year.
They have gone really hard, kind of like chewing gum does if you let it sit on a table after you chewed it (ok, not that hard but still).
The texture has gone from cream like to rubber like.
It does not stick to my fingers, and it is really hard to make lather from it, since it does not desolve in the water, but just sticks to the sides of my mug or inside the brissels of my brush.

Is this a common thing?
What can I do to save these creams, and make them useable again?