With care and precision, taking your sweet time, that's how! You will want to proceed with caution at every stage, using tools and chemicals specifically designed for the purpose. Using any that are not can result in further damage to a record that is already damaged enough to need cleaning in the first place! These solutions are relatively cheap and easy to find online or from your local record store, so do the right thing! Gentle circular movements with a dust-free microfiber cloth and some specifically formulated vinyl record cleaning solution will have your disc right as rain, provided the problems are only surface level and don't involve any scratches and the like.