I need to know how to clean and restore a fuel tank?

i don't know if the type of tank matters in the restore proses but its a fuel tank for a Plymouth Laser 1990... i pulled the fuel pump out and it is completely rusted and starting to erode... and the tank is not in much better condition... inside is all rusty... i need to know what i can to to fix it myself or if there is a place in Spokane WA that restores tanks...