oh come on, that's superficial. Clean it off with a scotchbrite pad, some WD40 and soapy water, will be fine.
I was on a ride once, down in the King's Canyon area, back country trail, like a 3 hour downhill run. Hot day.
Rider in front of me rode thru a pile of animal poop. Bear, horse, who knows what. Splattered all over his bike and all over me.
Was still a good ride. We splashed in the river at the end.
Mark Petry
Bainbridge Island, WA USA