Invariably any cave that receives traffic sustains damage from human visitation. This ranges from things as simple and unavoidable as contamination of the environment as a result of our body heat, breathing and shedding skin and hair to things very much avoidable such as trash and spraypaint. Often, cavers spend considerable time and effort cleaning up they caves they love during dedicated cleanup trips. Trash cleanups and graffiti removal trips to some of the heaviest visited caves are common.
Some caves require that lint, mud and oil sometimes be cleaned from formations and walls.
Often, you can hop a cleanup trip planned by someone else who knows what they are doing and can show you. Many states have a conservation association af some sort that should be able to help. Even if you are not involved in a dedicated cleanup trip, you can still do your part. First of all, take care to leave nothing you brought with you inside the cave. To me, that goes a step beyond vandalism to utter disrespect for the cave owner.