Well not bingo-specific, but Michael is an expert on
Antique Coin-op Games, so I wanted to include this`
Check his website out some day, he has a really cool
little video of a Magic Screen operating`
From: Lynne and Michael Sands
Subject: TECH: cleaning cloth insulation in very old games
Date: 1999/04/19
Question - I am looking for suggestions on how to clean the dirt and oil
off the cloth insulation in very old pinball machines. I am compulsive when
it comes to cleaning machines like to clean the insides as well as the
visible parts.
From: Bob E.
Answer - This is not exactly the same, but I have had good luck with
cleaning cloth-covered wiring harnesses from some of my English cars and my
jukebox in the following manner. Note, this is for harnesses that are OUT
of the machine, and I can't imagine anyone wanting to take one out of a
bingo -- *shudder* -- but maybe you can adapt this...
Anyway, this has worked for me on the type of wiring that is several or
many vinyl-insulated wires inside a braided or woven cloth covering. I just
fill a large dishpan with warm soapy water (dishwashing liquid is fine) and
lay the harness in it. Gently squeeze up and down the length of the bundle,
maybe changing the water/soap mixture if it gets particularly greasy or
dirty. You don't want to scrub and abrade the cloth, especially if it is
old, but squeezing seems to do no harm. When dirt and oil/grease are
removed, change to clear water for rinsing in the same manner, then set out
in the sun to dry.

ETE's website
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