Don't buy the crappy foam ones, especially at the price they sell them for at venues. They make good ones that are intended for exactly this use case (earasers,

Don't buy the crappy foam ones, especially at the price they sell them for at venues. They make good ones that are intended for exactly this use case (earasers, eargasm, etc etc etc) and do the job really well. You can often find them on sale for around $15.