which dawn?

I use Dawn Ultra Power Plus (or something like that) stuff is STRONG..

did half of hood w/ regular light blue dawn, and other 1/2 with Power Plus, the power plus side, imo, removed more "stuff"
 
I use the Blue Ultra stuff and haven't noticed any leftover residue.





I have also found that time is significant factor in getting the grime off... I wash a panel, let it sit while I move on to another, then return to rinse and rewash and sit again. I prefer to let the water and detergent do the work instead of mechanically scrubbing it off to minimize scratching.
 
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