Get you some oxiclean and make a solution with it, much stronger than what they call for. I make a solution that almost resembles a syrup and put the linens or whatever has those brownish stains on them and soak them for at least twenty four hours in a bucket of the solution. Then pour the solution in your washing machine, add another scoop of oxiclean some soap (not too much) and wash and rinse at least twice and see if that doesn't pretty well take care of the stains. I have removed stains from old linens for several people as well as myself this way. Good luck
themachinelady