Hi, just wondering if anyone cleans/sterilizes these any certain way? Given the price point, I imagine they are mostly meant to be disposable, or only used a couple/few times before throwing them away. I would like to get as much life out of them as possible, though. I read elsewhere that other silicone pads or “brush heads” like the luna could be soaked in 70% rubbing alcohol for 10 minutes, and am hoping I can do the same with the these. I have of course been rinsing thoroughly with warm water, and have used 70% alcohol wipes to wipe them off and it does not seem to be doing any damage, but wanted to ask everyone hear as well! Thanks in advance for any advice.