the car stinks like old cheese help!! How to clean the car:)

[classyinpink]

From two days ago, when I open my car, it stinks of old cheese. I have cleaned everything out and there is absolutely no decaying piece of cheese. The smell goes after I have been driving for about 10 min. I like my car to have neat clean look even though it's old.
Please let me know if you had any experience of this and point me to right direction of DIY car cleaning kit and way to do it. I have never cleaned it myself but I like saving money so HELP HELP!!

is there any sign of damp? including in the boot? Do you think any shopping leaked? Take out what carpets you can. If one of them is soiled you can hose and scrub outside, and line-dry or hang over a fence or something before bringing indoors to make sure it is totally dry and clean.

p.s. you can probably also lift out, or tilt forward, the back seat so you can brush, hoover and swab here.

I have a feeling something has leaked, or gone under or between the seats.