its all the little things that add up. Detail your engine. Polish the metals. I see you have an amplifier. Make sure it is installed with the wires being hid or tucked away as best as possible. But like you said cleaning is very important. I judge a dozen or so shows a year and you wouldnt believe the dirty cars i see. Why go to a show if your not going to at least clean the break dust off your rims and take the Mcdonalds cups out of the floorboards...
2000 Z28 - 330/300 12.6 @ 108 - Sold
2004 CTS-V - 420/380 - Sold
2000 C5 - Project 10's