Ok, so here is my situation. First off, I know absolutely nothing about cars except how to start them. My brother has a 2006 Nissan Altima SE-R. Recently, he moved to Texas and was unable to bring the car with him so it's sitting in my driveway at home. He's been trying to get rid of the car, and some guy is supposed to come and take it away. Here's where the problem starts: So I was bored on Sunday and I noticed that he had an extreme amount of dirt under the hood in his car. What did I do? I didn't spray it off with a hose if that's what your immediate thought was. I got a rag and soaked it with water, and then ringed the water out so it was just barely damp. I started wiping the dirt off of the non-electrical components under the hood. I also wiped off the battery (the cloth couldn't have touched both terminals because the positive one is covered with a piece of plastic.) So, anyways, today I go to start the car because my friend's father was interested in buying it for my friend, but the engine wouldn't start. My foot was all the way down on the clutch, the car was in neutral and I made sure to give it a little bit of gas so the engine would fire, but to no avail. Right away I called my brother in Texas and got an earful. I called my dad and we tried to jumpstart the car because we thought the battery might be dead. It didn't work. My brother says I may have fried the computer (I don't know how though) and my dad says it may be the starter. What I wish is for someone to read my pathetic and laughable story and to offer input and possible solutions. I told my brother I was sorry and that I would pay for anything I broke, but what really makes me want to cry is that he doesn't want this car in his life anymore. He's been trying to get rid of it forever, and here I go with my stupidity and break something. Please advise.