Once you have powered off the device, use a slightly damp cloth to wipe down the outside of the speaker. Be careful not to get water in any openings or crevices. Pay special attention to areas where there may be dust and grime accumulated over time. Once you’ve given it a good wipe down, let it sit and air dry completely before powering it back on.
For more stubborn stains, such as oil, lint or sticky residue from food or drinks you can use rubbing alcohol on a clean cloth to help remove them without damaging your device. Do not spray the alcohol directly onto your speaker; instead, dap some onto a clean cloth and then apply gently to the stained area. Make sure that you let the speaker dry completely before powering it back on.
Finally, you may want to use a vacuum cleaner with a soft brush attachment to suck away dust and dirt from any cracks and crevices that your cloth could not reach. Do this carefully and do not press too hard against the device as it can cause damage. Once you have finished cleaning, be sure to power off the device again before storing. Following these steps will help ensure that your mobile speakers stays clean for years of use.