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A white coating is actually detergent that has been left on the dishes; several things can cause this:
Newer dishwashers are continuously being made to use less water to meet energy and conservation standards. The detergent and rinse aid manufacturers have not changed their amounts much but the dishwasher manufacturers keep trying to make smaller size dispensers. With less water and more detergent/ rinse aid the white residue forms. The residue tends to build-up, and not just on the dishes but in the washer as well, so each wash just keeps over extending the amount of detergent, compared to the amount of water. If your detergent has rinse aid in it, then the problem magnifies. If your home has a water softener then the problem magnifies more; it makes it harder for the water and detergent to work together.
The first thing you will need to do is check the volume setting of the rinse aid dispenser; it should be set to only 1/4 of the allowed release; usually they are preset to release at 1/2. Next, whenever you fill the detergent cup, only fill it 3/4 full. Also check your detergent bottle; if it has rinse aid in it, do not use it; extra rinse aid will compound the problem. If you have a water softener installed, use only 1/2 the detergent and 1/8 the rinse aid.
Pour a cup of vinegar in your dishwasher and run it with no dishes and no soap on the heavy wash cycle; do this routine once a month since it is great at removing the residue and it will also help lengthen the life of your dishwasher.
In addition, always scrape your dishes and rinse them with water only, prior to putting them in the dishwasher, regardless of what the salespeople tell you.
As far as the manual:
Contact Bosch to obtain at 1-800-735-4328. It is listed as no longer available - This part has been permanently discontinued by the manufacturer and we don't know of any source for the part.
If you need further help or clarification on this answer, please do not hesitate to reply to this post.
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Best of Luck, Brian
Sorry about that. Dishwashers that use salt have a salt container and salt indicator light on the panel; I don't believe this model uses salt.