nprofile1qyt8wumn8ghj7un9d3shjtnyd968gmewwp6kytcqyqqeaq4qqddfuja5ks9xypklntkhg9hnccphsnx6qzktqgpt97acwqhq5vp (nprofile…q5vp) Well, erm, clean it?
No, joking aside, I've had to do such chores in various roles at the end of the nineties, so I can tell you that unless it was treated ridiculously badly you can safely remove the keycaps and use a vacuum to remove any loose dirt. Afterward, you might want to clean it with some alcohol, while the keycaps go into a tub with soapy water.
More important however: Are there still adapters to make this thing USB-pluggable? 🤨