Yeah-asking the counter people at a cleaning place if they remember a spot on a jacket strikes me as asking the kid at the fast food place if he remembers taking an order for fries. Kind of a stretch.
I don't think the CLERK's statement of NOT SEEING stains means ANYTHING AT ALL. According to Testimony, evidence, there were OTHER SPOTS on the JACKET LAPEL that were NOT REDDISH BROWN, or didn't show SIMILAR DNA to DANIELLE'S.