I usually soak it in hot/warm water for about 30 minutes and then just use a washcloth or something to try and get it out a little at a time and if that doesn't work I soak it in hot soapy water and try it that way. I think the soapy water would do better for you. It usually works for me.
It would be wise to put this in the math section otherwise you wont be able to get the help you need so others cant help you when you need someone to. I would suggest putting this in the math section so your question is answered quickly with no problems at all.
