?? scratching the stickers with your nails or should be another way? wash sticker with warm water and another liquid maybe?? any help is appreciated...

Are you referring to external stickers stuck to paint work, or stickers stuck to interior glass? In the case of the former, try gentle heating with a hair drier to loosen the adhesive. In the case of the latter, a smooth clean knife blade should work easier than a finger nail without scratching.

thanks leeboy...i am referring to external stickers stuck to paint work...