The problem with most AMMs is that they work by tranfering heat across a surface to the air that passes. Any form of covering insulates that activity. Thus in many manufacturers there is some evidence that cleaning the surface restores sensitivity.

I have never heard a competent reproducable technique used on the style AMM that is failing on MBs (yours in particular).

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Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician