This is my super duper WFMW tip. I don't burn things often but when i do it's usually because i'm off sewing or crafting for HappyHouseQuilts and JUST need One More Minute of time which turns into 30...so pasta burned on the bottom of the pan is yucky but who has time to scrub?...who has the money to throw it away and buy a new one?
Oh the best is chili...burned on hard to the bottom of the Le Cruset pot...ugh!
Well my soloution that I learned years ago and have since lost the source is to NOT soak it...but cook it! Yes, add about 2 inches of water and about 3 Tablespoonfuls of BAKING SODA and boil it...now DON'T go and leave this pot or you will have more mess to clean...the concoction can boil over quickly...so repent for your original mistake of being neglectful and stay close...slowly but surely the caked on, hard crusty food will chip and scrap away easily with out the need for a hammer and chisle! You may need to perform these steps several times depending on the thickness of the burned on food. GOOD LUCK!