[318supersport]

heres the problem , my master has 138,000 on it and its shot . i got a reman and has no res. i still have the old 1, but it was full of contaminated brake fliud and left a nasty residue . i was able to get the fill side clean by rubing my finger around in it, but the back half is not reachable. ive tryed soap/water , parts cleaner, and mineral spirits ......... nothing gets it clean . ANY IDEAS ? i would hate to pay $70 for a small piece of formed plastic =(