Next time you finish a workout at the gym, take an extra minute or two to wipe down the equipment you were using so it will be clean for the next person to use.
You are doing your part to stop germs from spreading and keeping the gym a sanitary place to go.
If you notice someone else didn't wipe their equipment down, go over and do it for them. Always put weights or exercise equipment back where they belong when you are finished using them. Let someone else use the equipment you were going to use ahead of you.
Bring your own towel and keep your equipment clean while using it.
Read more about proper gym etiquette.