Canon IXUS 50 - Manual (Page 174)

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Camera Care and Maintenance
Use the following procedures to clean the camera body, lens and LCD
monitor.
Never use thinners, benzene, synthetic cleansers or water to clean the
camera. These substances may distort or damage the equipment.
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.
Never use synthetic cleansers on the camera body or lens. If dirt
remains, contact the closest Canon Customer Support Help Desk as
listed on the rear of this booklet or the European Warranty System
(EWS) Booklet.
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.
Never rub or press strongly on the LCD monitor. These actions may
damage it or lead to other problems.