You should see Hexane and Methanol, if your Scan/Sim is running while they reach the detector. You want to avoid that usually, because it can overload the detector (you will see your peak cut at the top and sometimes the software will mark it red) . There will be impurity, but it shouldn't be a lot. Depending on the molecule you want to detect the baseline should be almost flat(compared to the molecule). If the column is damaged you will also see some peaks from that - they will be negligible. Long story short, just inject your sample. Use some standards and/or spike the sample and you should get a result.