I have a Radar inbound and was thinking about swapping out the black earsocks with some white ones. For those with white earsocks, how difficult is it to keep them clean and spotless? Do they yellow after exposure to sun, sweat, etc.? Looking to spice up this all-black frame and can't seem to decide whether to go with white or yellow socks. Would hate to spend money on them only to replace them a couple months later. (First world problems, right? ) Also, what is that lubricant Oakley dips their glasses into when they're putting on the earsocks on those custom Radars (as seen in those Safehouse videos)?