Will customers refuse a liquid tank if it is stained on the inside?

Good morning fellas. I picked up a trailer yesterday from the tank wash in North salt lake. Never had an problem with them before. Pretripped the tank and noticed that the inside was stained. it is noted on the washout paperwork, but I had never saw a stain like that before. I notified my dispatch and sent him a pic of it and he didn't seem to care. my external valve was spot less as is the rest on the trailer. I didnt see anybody there to talk to about it and I know that our trailers can sit there for quite a while before being washed so I attributed it to that and thebfact that I couldnt scrape any residue off, so I left.

now after 400 miles of it really bugging me, I thought I'd get your opinion. I'm in Ontario, OR, headed up to Lewiston to pick up crude turpentine.
Here's a pic of it. What do your experienced eyes tell you? Thanks fellas.

 

Thanks. It doesn't have an odor. I hopped in and scrubbed it at it with a wet rag and it looked better until it dried then it returned to normal.

I wont comment of my adventures of trying to get back out of it, lol. Boy, put on 30 lbs and suddenly everything becomes complicated lol.

 

I wont makes excuses. I had all the caps open as well as the internal and external valve there were no odors and I knew what the previous product was as well as having my phone with me. Plus I asked the driver working on his truck next to me if he would keep an ear on me. I knew I could get out, I just hadn't planned on blowing my britches out doing it. At least my 'spotter' got his seven chuckles out of it.

 

Thanks Pattyj. I wasn't sure. I'm worried about the customer being picky. Solvay in Long Beach takes your external valve apart and run their fingers on the inside. if there is any moisture, they fail the trailer and make you go rewash it and dry it. I've had a few even open my air supply lines and check for product in there.