Quote:
Originally Posted by Darren69
When one our lab guys at work did my Dell Ortos I believe he used Toluene and you wouldn't believe the colour of it, completely pitch black at the end. So i knew they had had a good clean. You can repeat the clean cycle with fresh liquid until it stays clear.
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I would not use Toluene even if you can get it as it is highly inflammable and harmful by inhalation!
http://www.chemtek.co.uk/data_sheets/TOLUENE.pdf
Brake cleaner, usually isopropanol, is safer and not too costly.