I have a hard & fast rule . . . If a reel gets dunked, it comes apart, ASAP, gets totally cleaned, and re-lubed. If on vacation, it happens right in the hotel room !
Tight Lines !
I will concur with Tuna's close associate Dave on this one, unless you have a Van Steal which I believe is sealed in some fashion, you cannot submerge a spinner/casting reel in Salt Water/Sand and expect a reel not to have problems, unless you are rinsing/lubing out the interior before corrosion has had time to set in.
I have from time to time rinsed off Daiwa SL30SH's in the ocean after they got sand in them. and ABU's after getting "Point Washed", but after I leave the beach I take the side plates off and clean and re-lube the bearings.
By the way getting "Point Washed" means you waded out on the spit at Cape Point and then had a wave break over the top of your head. (Which signals that it is a good time to wade back in a little closer to shore).
I also will take the rod butts with reels mounted on them into the Shower and rinse them with hot soapy water at times even if they did not get dunked.
Back in the day, day after a Hurricane one time in Rodanthe, CE Midgett (RIP) had a broken foot in a cast and could not walk real good and we wanted to check out Rodanthe Pier, drove down the pier road from Rt. 12 in 12 inches of running tide, ran into a three foot hole in the road next to the Redheads old house on Atlantic Drive.
We were stuck until a big comber came in and smacked into the front of my F150 beach truck....the wave lifted my Truck out of the hole and I hit reverse and got out of there.....forgot to re-lube my wheel bearings and two months later, they all had to get replaced by Gary Midgett (RIP) at Mac's (RIP)....seems like sometimes me and the Redhead and DD are the only ones still at them Drum from the old days...