What kind of bottom bracket (manufacturer and model) do you have? In any case, I'd remove the crankarms and spin the bearings or axle to feel how stiff the bearings felt. The best maintenance is the preventative kind. If you know you are going to submerge your bottom bracket, cover the bearing seals with a thick coat of grease. Once water gets inside the seals and contaminates the inner grease, you need to rebuild or replace the bearings. I ride sealed Shimano cartridge units that are not rebuildable and are not designed to be submerged, and since I stopped submerging my bike, I no longer have to replace them. I don't even spray my bike with a hose anymore. I just let the dirt dry and knock it off with a rag, and polish the bike with a wax-based wood polish.
If that water was a Minnesota river or lake, be sure to check the bike for Asian millfoil and zebra mussels before swimming again.
On a more constructive note, you may want to check the bottom bracket cartridges. Contrary to popular opinion, at least some of them can be dismantled, to pop the seals on the bearings, clean & re-lube, etc.
Work is the curse of the riding class.
So I've been in the water with my Mukluk (2011) and I know how to grease wheels and head but I have little to no idea what to do with a bottom bracket.
I'm good with tools but have little experience with modern bike design. What is the check list of maintenance after swimming with your bike?
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