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that at least one instruction book advocates the use of a bone or hardwood scraper for cleaning the gate, but on principle the author strongly disagrees with such advice. A piece of wood, no matter how soft, will eventually cause scratches upon a steel surface, simply because the grit and dirt it is supposed to remove becomes embedded in the wood itself.
Dust, and the emulsion scraped from the film, will usually collect and build up in the gate and on the edges of the sprockets, and this should be removed by means of a brush. Special gate brushes may be purchased, and these are ideal and a lot safer than any other kind. The brush should be used for cleaning the gate after each spool and before every show, but dirt which has to be removed by the use of a solvent will indicate by its presence that you are not using the brush correctly or as often as you should. Carbon tetrachloride, methylated spirit, or any other suitable solvent may be used for cleaning the metal surfaces of the film track, but the latter should be polished with a clean rag afterwards.
Surfaces of chrome, however, should be cleaned only by using a special chrome-polish — not ordinary metal-polish.
Seven Commandments
Always oil your projector where and whenever necessary.
Avoid scratching at all times.
Keep it spotlessly clean.
Never force any part which will not fit properly.
Never experiment — ask about anything of which you are not
sure. Never service the projector with the mains connected. Switch
off and disconnect the electricity supply first. Nothing "live" should ever be exposed. And remember— CARELESSNESS KILLS!
The Lens
Both projection and condenser lenses require daily cleaning. Dirty condensers lead to loss of light, and dirty projection lenses result in poor definition. They are made of a special optical glass, which may easily be scratched, being somewhat softer than ordinary glass. Because of this, dust should be removed by blowing before cleaning and polishing.
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