You guys might be right. I never thought it was alm. oxide. I thought it was calcium from hard tap water that may have been in the systm. (like the stuff that collects on a showerhead) I didn't put it in there sombody ownd the car for 15 years before I got hold of it.
The monovalve on a W126 is between the 1st and 2nd firewall between the battery and the computer.