A foggy site glass is OK when the auxillary fans are on. I always charge mine until the glass clears and then cycles with bubbles and clears again. I have done this time and time again with no problems.
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM