**UPDATE**
Well, it's safe to say these motherfuckers are crazy. I had to stop conversing with them over it because it would have escalated. What I got from the convo is i'm too anal, i'm always over there(my yard) cleaning something, I am overreacting, I didn't give them the time to remove anything, since I took it early and to top it all...There is no way they got stain on it. If there is stain on it, no way they did it.
This incident has officially turned me into a "dont fucking ask me to borrow anything" kinda guy. Simple as that, period!
This conversation continued to text today while I was at work that I had to leave the building to go call and scream in the phone..The fucking nerve of people to not even take responsibility when they fuck up. A simple "sorry, i'll do my best to clean it" would have been enough for me. The fact that my washer began to stay outside for a few days while they had it and the fact that the blow-back from their stain sprayer covered my washer means they have no concern for other peoples shit.
Her last message to me was something like "your washer can stay brown, you can stay pissed and i'll just go rent one to finish, since this is what you want anyway".
I simply replied "just return my shit in the condition I gave it to you in..Why is that so hard to understand".