Here are ways to prevent stretch marks during pregnancy. Lemon juice. With its acidic nature and natural bleaching properties, lemon juice is one of the most effective remedies to lighten stretch marks. 1  Simply cut a lemon, squeeze out the fresh juice and rub it gently onto the affected skin.2  Keep for about 10 minutes and then rinse off with a little warm water.emon juice. With its acidic nature and natural bleaching properties, lemon juice is one of the most effective remedies to lighten stretch marks. 1  Simply cut a lemon, squeeze out the fresh juice and rub it gently onto the affected skin.