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There are special detergents for upholstery dry cleaning in the shops, although if you want to clean naturally you can use baking soda.
In such case when you want to preserve the battery for a long time all you have to do is just to disconnect the battery from the car and there...
The toothpaste method really works. I agree
I wash my car 2 time a month in a car wash and I use car cover when I don't use it.
If you want to clean some stain naturally you can use baking soda or vinegar. They work for almost every stain.It's cheap and efficient solution...