I am not a chemist or a mycologist (an expert in different types of fungus), however, I was told by folks who specialize in decontamination of various structures and items that many household cleaners, bleaches, cleaners such as ammonia do not necessarily kill various moulds but sometimes activates them and in certain cases, causes them to spreaders become airborne.
The bad smell in old cameras is usually due to mildew. It attacks leather, wood, and certain animal glues that were used in adhering leather coverings to wooden or metal camera bodies.
The special chemicals and cleansers, such a Mould Control are actually intended for household use in bathrooms, etc., however, on old cameras, radios, etc, I have used it successfully without causing damage, however, I do not spray it on or apply it generously I dab it on with cotton balls and swabs, wipe it off with a clan damp rag, and the dry it carefully. When it is thoroughly dry and the odour is eliminated, I then apply leather waxes or furniture polish to re-lubricate the leather covering or wood.
If I intend to actually use the camera, I make certain that none of these chemicals or polishes get into the mechanism or the lens.
The is a Facebook group of folks who are interested in old Graflex equipment. Many of the members fully restore old Graflex SLRs and equip them with modern or fine vintage lenses. They entirely stip all the old leather coverings and paint and clean and stain the wooden bodies, refurbish the mechanisms, and polish the brass fittings.
If a camera is extremely rare and collectable and has significant value, I wor not attempt to do any of the work on a DIY basis. There are antiquarians and conservators that specialize in the matters and the job would be best done professionally.
Attaced is a picture of me with lots more hair, back in 1979 with an old 8x10 camera that I acquired from a retired photograher who hep it in his cellar fored 50 years. It smells like something from an excavated tomb. I brought the stand and the body to an antique furniture restorer and it came back as good as new. I come upon n old lovely Taylor, Hobson and Cooke 300mm Variable Soft Focus lines and used them on with 8x10 and 5x7 film for years.
Now, I am the "Antique
!