Do you think anyone will notice if wipe up the bathroom counter with my gf's towel
Why would you do it with her towel?
I just recently realized that I hate the way she uses the towel.
You shouldn't use someone else's things to clean with without their permission. Your gf might get pissed.
She won't know it was me when she sees that her towel is dirty.
It's very disrespectful to clean the nasty bathroom with the towel she uses on her body. You should have more consideration for your girlfriend than that even if she would never know you did it. Just find a cleaning towel to clean with and leave her stuff alone.