It sounds like Naugahyde (nylon covered cloth)...eekes! Well, you could try a mixture of 90% water and 10% mild dish soap. Scrub Very gently, but vigorously to remove the stain, then dry with a white cloth. Could you please tell me if it is smooth 'leather', or suede-like? Then I could help you much better.
This didn't work very well any other suggestions?
The only other suggestion I have to keep it safe is to contact the manufacturer and ask the precise cleaning instructions. I have heard you can use dry cleaning solution, but have not tried it myself.