> I've been using mine daily for around 10 years, and yes, you are entirely correct. If I could somehow clean all the coffee stains and grime it has accumulated it could probably pass off as new!

Same... Once in a while I took all the keycaps off of my HHKBs and vaccuum clean everything, then clean everything using q-tips, clean all the keycaps one by one. They're looking close to new despite heavy years of daily usage.