BBGG wrote in post #2118448
I'm planning to bring one lens, to avoid changing lens and also pack light. Camera will be in a zipped bag when not shooting, and
cleaned with brush and cloth every day. Hope that will work out.
While your thoughts on cleaning would work for the camera body exterior and outer barrels of lenses, the brush and cloth method is absolutely the wrong way to start the cleaning process for glass surfaces such as your lens, viewfinder, filters, etc., when you have dust - and particularly sand particles - on your equipment.
You need to blow off as much of the particles as possible with a squeeze-bulb blower (NOT compressed air or "canned air"). Once you have most of the particles off, then you need to clean the glass surfaces with a wet cleaning process (moistened lens tissues) and avoid any pressure that could grind remaining particles into the glass surfaces and cause permanent scratches. Never use a cloth or other re-usable wiper to clean the lenses, as there is always the possibility of having particles trapped in the wiper from a previous cleaning.