Canon A540 - Manual (Page 118)

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Camera Body
Gently wipe dirt off the camera body with a soft cloth or eyeglass
lens wiper.
Lens
First use a lens blower brush to remove dust and dirt, then remove
any remaining dirt by wiping the lens lightly with a soft cloth.
Viewfinder and LCD Monitor
Use a lens blower brush to remove dust and dirt. If necessary,
gently wipe with a soft cloth or an eyeglass lens wiper to remove
stubborn dirt.
Camera Care and Maintenance
Never use thinners, benzine, synthetic cleansers or water to
clean the camera. These substances may distort or damage
the equipment.
Never use synthetic cleansers on the camera body or lens. If
dirt remains, contact the closest Canon Customer Support
Help Desk as listed in the European Warranty System (EWS)
Booklet.
Never rub or press strongly on the LCD monitor. These
actions may damage it or lead to other problems.