The yellowed liner or filling are normal results to the oxidization and body’s natural oils, but you should clean them periodically to restore their clean and new look. The following lines will help you remove such spots and restore the clean white look as per the type of your sofa’s cushions.
Before cleaning your sofa’s cushions, you should read the tags carefully and define the proper way of cleaning them to define if you can use liquids or not. If you can, you can simply soak your yellowed cushions into the washing machine along with a cup of hydrogen peroxide and a half cup of pure vinegar and run a cycle to get rid of the yellow spots. You can double the amounts of solutions if you have several yellowed cushions or your cushion has deep yellow spots.
To remove the old and hard yellowish spots on the washable white cover of your sofa’s cushions, you will need a powdered cup of laundry, bleach, and dishwasher detergents in addition to half cup of borax to soak your cushion along with boiled water for about half an hour. Now you can wash the cushions and dry them using your electric washer to remove the yellowed spots and provide your cushions a brand new look.
What if you try the previous cleaning methods and the yellowish spots are still eating your cushions? In such a case, you can use the secret weapon, i.e. the pure bleach. Such a harsh material will certainly restore the white color of your sofa’s cushions, but you should use it carefully and rarely to maintain the durability of your cushions.
If your sofa’s cushions are not machine washable, you can mix such detergents with cold water and use a clean white cloth to dab the spots from the external part to the center of the spot. Covering your foam sofa’s cushions with liners and water resistant fabric will protect them from such yellowish spots providing them an impressive look.