[vcf-midatlantic] clean old antistatic foam off IC pins?

Hi, Do any of you have any information on what is considered the best/most appropriate way to clean off petrified antistatic foam off of IC pins? I have come across some vintage ICs I want to save and try to sell to finance other parts of my hobby. These particular ones are gold plated, but that said, some of them have been corroded through regardless, while some are just ugly looking. I've been using IPA, drafting eraser, and Xacto knife to clean the majority of the crud off, but very few of the pins are looking particularly shiny. I don't want to get too aggressive and break more pins off, but they don't look all that great at the moment. Matt R