Please do not use your towels to wipe sweat off the table. There should be a cloth or other blotter supplied by the venue Owner and kept under the table along with hand sanitizer.
If there is an Umpire present (player/umpire or scorer or anyone sitting in the umpires chair), it is their job to maintain the table. Ask them to wipe the table. If no umpire, use the provided cloth and remember to sanitize your hand(s) straight away, before touching your racket or ball. Ideally, you should sanitize