Here at Lake Mead and at many fresh water locations the boats getting powerwashed are not bottom painted. The hard paints that are not ablative work much better, you can bottom clean off the softer paints early as I learned the hard way on my first sailboat. What I see them kick about on inspection is anything wet, even dead mussles that are attached, standing water, and if the boat has not been of the water fro 7-10 days, especially if it has not been hot or hot and dry. They check anchors, chain, and rope rode, outdrives, outboards, anchor lockers, fish holds, thruough holes, low swim steps, dinks, live wells, and anything else seems like it could host the little shell rats. Some folks shut off their through hole valves, especially if they are hull side. At some of the stations it seems that hot not pressure is the goal with the wash down. Also, sometimes they give your trailer a real once over and I have seen inspection tags/one time use ties used like on semitrucks. I too have seen the inspection station at Powell not open and the same at Mead but then I have seen a line of boats also. Hope this all helps. Thanks for caring. Bob Jarrard