Take all the old silicone out and redue it!!! In the DYI thread there are links I'm sure. Not sure if I put mine in there or not....actually I think I did. It's not that hard, just have to make sure you get all the silicone out (the old) cause silicone don't stick to silicone and you'll have another mess.
That stinks, sorry to hear it!!

That stinks, sorry to hear it!!