If you use your Snugs in the gym or onstage a lot, there will likely be a build-up of natural oils. If this is the case, you can then wash them in hand-hot soapy water (washing up liquid works best), and allow them to dry naturally. You can also wipe over the drivers with an alcoholic wipe to remove the natural oils. Do not use anything abrasive or containing petroleum when cleaning your Snugs as this may damage the silicone.