You didn't state if these are DOT spec or Euro spec lights, there is a slight difference. Euro spec lenses are held on by metal clips around the perimeter. DOT lights have the plastic headlight door which is held on by 6 plastic clips built into the door. Removing the door on the DOT lights will not get you inside the lens. The only way I can think to clean DOT lenses is to completely remove the assembly and wash out the headlight unit in the sink. Probably be bee-itch to dry and no idea what will happen to the reflective coating.

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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.