The building I work in has a small gym. Its nothing fancy; there are a few treadmills and ellipticals, a weight rack, some weight machines, etc. It is a pretty basic spot, and its not widely used; It is free and open to anyone who works in the building, but as far as I can tell, traffic is really limited to like 15-20 people a week.

Here's the thing, there is no cleaning supplies anywhere in the room. There is a sink, but no paper towels. There are no towels, spray bottles, rags, ANYTHING. Now I'm familiar with gym etiquette - clean the equipment that you use, but what are you supposed to do when there are no supplies? So when I'm done exercising, I just leave. I don't wipe down anything, I don't disinfect, because there is nothing to clean WITH. 

This one woman is also a regular there, and I see her almost ever night, always running on the same treadmill. Apparently, she brings her own cleaning stuff, clorox wipes or sometimes paper towels and some sort of spray, and she will wipe down her equipment with it. And she will shoot me really evil glares when I leave my equipment after using it. Recently, she has been staring at me and scoffing when I'm done walk away. Its getting to the point where I can swear I can hear her mutter under her breath about how I'm so rude for leaving the equipment dirty.

Am I the asshole here? Yes I'm leaving the equipment all sweaty, but there isn't anything for me to clean it with, and I'm not about to go purchase clorox wipes on my own to clean equipment that like, 20 other people max in the entire building use.

TL;DR Small gym at work doesn't have any cleaning supplies, so I don't clean the equipment I use. A woman is being really passive aggressive about me not cleaning the equipment I am using.