Yikes!

Recently I made a startling discovery.  Our mop is over seven years old.  Now before you gasp at how disgusting that might be...please know that I do change the sponge head on it after every few uses.  But still, the thing is old.  I'd like to try a new microfiber mop.  It would be great to be able to throw it in the washing machine after every use.  Exciting stuff, right?