Hello. We are leaving for our vacation in a couple days. I am bringing my Brompton and we're going to bring my 4.5 yr old son's bike. We are going to the Washington Coast where the sand is hard packed enough you can drive your car along the beach. The plan is to take off my son's training wheels for the first time and let him loose on the hard sand. That means I am going to be biking after him.

What kind of post-ride maintenance do I have to do to the bikes after our rides along the beach? Just spray down with water to get the sand & salt water off the wheels and frame. Then let air dry? Anything else?

Do I need to be concerned about sand getting into my rear shifter (I have an H6L)? Or will a good spray down fix that?

Thanks in advance.