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Hi.. It is always better to keep it separately with the dividers in between so that it is not in contact with the soap suds from the other side. I also used to keep the bottle brushes separately for baby bottles.
The only concern I took when it comes to sponges for my LO is to make sure it is not touching a surface that can collect dirt. Separating is advisable cos you won't want soap suds from the adult side.
Instead of using sponges, why not use a wash cloth? And yes ill definitely seperate the e sponge for hygiene purpose.