Yes, I've restored three Lisa keyboards by cleaning and replacing the foam pads. A little tedious but very effective. I've used pad from TexElect.com for all three. Highly recommended.
This is not strictly a compact Mac question but there may be some fine points particular to them and similar age electronics.
Up 'til now I've been cleaning boards with IPA and a toothbrush, but I finally purchased an ultrasonic cleaner. I'm tested using diluted Stens 770-100 Ultrasonic...