You actually never want to use soap, rubbing alcohol or other detergents as even the mildest of them can break down the foam. You also want to avoid handling them immediately after applying lotions or hand sanitizers.
You can clean your Comply Foam tips by gently wiping them with a clean, damp cloth (water only). Allow the tips to air dry completely before their next use.
Beyond this, we usually advise the general common sense care of your ears and your listening device (clean ears, nice storage pouch or case, no excessive heat or cod) are sufficient care for your tips.
I hope this helps! Please let me know if you have any questions.