Bacteria, disease, etc. is trasmitted very easily through sweat and it is important to clean the equipment.
Thankfully I go to a gym that is a super gym that is obsessed with bacteria and cleanliness - they have disinfectant bottles and towels at every piece of equipment as well as personel that comes by and does it on the hour every hour and they take swabs and send it off to labs.
I always wipe before and after use everything I touch.
some italian, german, and japanese ones; and on order more of the same