We recommend cleaning your case with mild soap and water. We find that most stains can be removed using this process. We do not recommend machine washing as this will have some adverse affects on your case. If mild soap and water do not do the job then you may want to try using a non-abrasive carpet cleaner. We have had some customers report success with more stubborn stains by using this process. You will want to test the cleaner on an inconspicuous spot to see if it will cause any problems with the cases finish.
For our plastic cases with a gloss finish, a contact cleaner should work if something more than mild soap and water is needed. If the product has a soft touch coating, don't attempt to clean, with anything other than a damp soft cloth as chemicals will likely cause the soft-touch coating to peel.
Please keep in mind that we do not warrant our product for finish damages caused by any type of cleaning or attempts at cleaning.