because some one egged you.
Car exhaust can smell like rotten eggs when the fuel has a lot of sulphur in it.
If a car begins to smell like rotten eggs and then starts acting like it has bad gas, it may have been filled with the wrong type of fuel. This smell is common when diesel fuel is burned.
this is natural and there isn't really anything you can do for it.
Typically this is caused when the fuel is burned uncleanly and the sulfur in gas makes it smell
If it is not actually over heating, then if the smell is outside the car, look for coolant leaks around the head and the thermostat cover. Inside the car could be a leaking heater coil.
If your car battery smells like "rotten eggs" then your battery is producing excessive hydrogen and is probably not safe. Please check you cars' charging system and make certain that the battery is not being overcharged. The battery can possibly explode.
You normally smell the antifreeze so open the hood and look for a leak before you see it big time running out from under your car.
A car may smell like sweat due to gym clothes, or other workout clothes, being left in the car.
No it would be terribly bad for you and the will smell, from anonymous
may be pre-cat exhaust leak.
It makes your car smell somewhat new, but be careful as too much will make it smell like a cab, unless of course you want to go for the cab smell.
a leak is probably getting on something hot and cooking away