they fill them with electolyte, put them on massive charging racks, fully charge
them, then drain, rinse and redrain.

then they are shipped as dry batteries.

if they are rinsed well, and if you are concerned rinse twice, there wont be enough acid to cause issues.

rolls/surrette advertizes a 5 year shelf life without loss of capacity, i have spoken with their engineering staff and they told me i could go to 10 years with only minimal loss of capacity. i have no idea what minimal is and they wouldn't say.

back in the olden days it was common to drain and rinse batteries and it was reported that they could be stored indefinetly. but again there was no reference what indefinitely means, i would assume that to be a subjective term.

it stands to reason if they were able to do it back in the day with wood seperators the more modern counterparts probably would fair far better.

if it were me, i would order them dry if you have not bought them yet.
but if you have them wet, i would not hesitate to drain/rinse and store them.
i might even go to the trouble to get a cylinder of some inert gas and purge the air out of them and use rubber corks to seal the cells, but i would check with someone like rolls/surrette to see what gas they use. maybe nitrogen would work an it is much cheaper than something like argon, ideally co2 could be used, it being a heavy gas one would not have to use rubber corks just put the caps back on.

any loss of capacity is going to be likely far less than what you would have in long term wet storage having to babysit them.

btw,, rolls produces and sells about 70% of their batteries dry, again they all start out life at the factory as wet cells.