Post beach day care/cleaning advice?

[Xinia]

Hello everyone! I'm a newer 4Runner owner and never owned a 4x4 like vehicle before so I'm learning and exploring all sorts of new adventures. I recently took my 4Runner to the beach to watch a beautiful sunset and got so many fun pictures! I knew post care for going to the beach at least included a full spray off both on the exterior and under the car. I don't have access to a normal hose, so I usually go to a self-wash that has the high-pressure nozzle only. I spent a bit of time spraying all under the vehicle and all in the wheel wheels to get sand/saltwater off the components. Something I noticed is even after all the spraying I did, I could smell a saltwater or sea smell approaching the car. I was so confident I got the majority of it, so I tried to see if it got crammed into trim pieces near the doors. Well, I ran my finger along the inner piano black fender flares and found a thick row of sand trapped. I tried to put on gloves and use my finger to push what I could out. I spent some time researching and came across neat nozzles and things to flush out places where sand could get trapped, but I don't have access to a garden hose. Something I'm not confident in doing is flushing the frame under the vehicle. I found a ton of info on the 5th gen, but since I didn't own, I'm not sure what applies.

Is this necessary to flush the frame after a beach day or every so often?
Any tips or tricks on the 6th gen on undercarriage cleaning for future beach days?
If I make sure to thoroughly wash the undercarriage after each beach day, will the sand trapped dry and fall out with generic road driving?

Any and all advice would be much appreciated thank you very much!

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