Edit - Just realized you are referring to actual sumo suits, not sumo suit Wrestling costumes that are made of vinyl.
I will leave this information up since party rental companies may find this useful:
Green Works All purpose or their Cleaning Wipes are really good natural cleaners and dermatologist tested (so it won't irritate skin). After cleaning them we go back over with a clean rag soaked in hot water just to rinse off any cleaning residue.
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