To remove rubber from blade follow what Lazer said, from side to side,
To remove glue from sponge use Indoor Pure Bright Lamp Oil.
Take small piece of kitchen sponge, put few drops of oil on it and go over glue, make sure you don't go over topsheet.
Leave it for 5-10 min and you'll be able to remove glue with your fingers without damaging the sponge.
After glue is removed wait few hours so oil can evaporate and you're ready to re-glue.
Make sure you go with pure bright oil, not cintronella.
Here is link, 1L will provide you enough for a life time.
Barrenttine H9119 Pure Bright Lamp Oil 1 ltr : Amazon.co.uk: Lighting