Originally Posted by Geek
I wish I could get my overflow bottle that clean. Mine had gotten quite a bit of crud in it and when I disassembled the rads, etc to flush it last fall I tried all kinds of different things to get the slime off the inside of the bottle to no avail
My overflow res. was all funky after my waterpump seal went bad. Someone here recommended rice. That's right, uncooked rice. Put a quarter cup in with your favorite cleaning solution and shake the hell out of it. Mine cleaned right up! The grains are like a low intensity bead-blaster or sand blaster, pretty cool.