What is this stuff ??

T

Tom-D

Member
today I removed the old covers from the 170's wings and found this stuff in each wing.

It is water soluble, washes out easy with a little soap, and water, leaves no corrosion behind, it was on both sides of the front and rear spars. and inside the leading edge "D" box.
 
Some of the drip-like formations suggest to me some fluid seeped in and dried. Or not. Any sort of exterior cleaner that might have gotten inside and left some residue behind?
 
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