I realise that painting and photographing an endless summer will involve a number of beach visit. Fine sand being the natural enemy of precision camera components, and particular hard on SLR camera. Thus I have designated my canon camera for beach duty. Not that I haven’t used my Pentax many times already at the beach. However the Canon camera bag is smaller and seems a tighter so less likely to fill with sand (or so I thought). after a few days of such beach duty The camera and bag had fine sand everywhere, so before I looked at dust on the inside I got out my hairdryer (I have one to dry watercolours) and gave it a good cool blast and use a soft watercolour wash brush to dust as I went. I also emptied the camera bag, took it outside, turned it upside down and gave it a long blast with the hair drier. That fine sand is pesky stuff but it does respond to a strong air flow.
HOWEVER SET THE HAIR DRYER TO COOL! be careful not to overheat the camera or components
The all important question remains. What about dust on the sensor? Well I didn’t change lenses at the beach and the sensor appears to have no more dust than usual.