[R-390] Rat Track Solvent?

[Scott]

Hello All----

A while back, I remember conciderable disscussion on various cleaning materials for various problems and places in the 390. I'm not doing a 390 just now (three to go) but the solution to my present problem might be useful in sombody's 390 restoration.

Recently, I said OK to a request to fix a repeater that suddenly quit after years of trouble free service. I found a critical wire chewed in two and several more "almosts". The fixes were easy but a problem remains in the cleanup.

Rat trash and droppings (OK to read as a common four letter word) swept and vacuumed out of the rack easily but the brown "tracking" residue remaining on the base surfaces and apparent rat trails is resistant to everything I have tried----water, dish and laundry detergents straight and with water, 409, alcohol, "Goo-off" and paint thinner. The crud releases from vinyl wire with a lot of scrubbing using one of the detergents and water but nothing I have tried lifts the crud at all from a painted, bare, galvanized or plated metal surface.

What works?---any and all practical suggestions will be tried and their performance reported and I apologize for stretching the 390 boundry a bit.

Thanks much--

Scott, N6NXI

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