Just went to rack my AHS Pumpkin Ale to the keg and it had a funny look to it. Over the weekend my brother helped me brew a Hefeweizen and i noticed that he took the top off of the pumpkin ale and didn't put it back. Top was off for maybe 2 hours. The top of the beer has some white film on top with white stringy lines and some white bubbles and chunks. Haven't seen anything like it before. I smelled it and it has a very very strong chemical smell to it. So what do you all think? Infected? I have a hard time taking pics and getting them on the computer but i will try (can't promise anything though). Thanks in advance for the help!