Cleaning will not help. The problem is pitting of the pintle. That is a mechanical failure that no solvent will cure. Replace them and the seals for great results that include better idle and easy starting. We sell them on the partshop.

------------------
Benzmac:
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM