Hi rgraham,
Ditto to Sleeping’'s suggestion. They will know better than anyone how to clean their cover.
The latex underneath will probably be fine (if the cover absorbed the accident) but there are some suggestions for cleaning latex here and a little more information in this thread if this is necessary.
All materials including latex will have some degree of offgassing (some of which can be smelled and some that can’t) but the important part is whether any offgassing is harmful. Even food has offgassing that can be smelled. In the case of latex the smell isn’t harmful. Talalay latex tends to have a sweeter smell and Dunlop tends to have a more rubbery smell but neither are harmful and both have been tested to Oeko-Tex standard 100 class 1 (safe for babies) standards. Both will dissipate to levels below normal detection but the rubbery smell can last longer than the sweeter smell.
Most of all … congratulations on your new mattresses. You certainly made great choices
I hope you have the chance to let us know what Shawn or Jeremy at SleepEz say about cleaning your cover.
Phoenix