The original OVP's are a known bad part.

Use the search function to find the part #.

If yours is the old, bad part #, then change the part. Cleaning it will do nothing.

__________________
Paul S.

2001 E430, Bourdeaux Red, Oyster interior.
79,200 miles.

1973 280SE 4.5, 170,000 miles. 568 Signal Red, Black MB Tex. "The Red Baron".