Yo David of Chicago:
That's my old home town!!!! Loved the Como Inn, which is now out of business. I worked there after my military hitch; grew up with the owner's son. I miss the restaurants of Chicago for sure.
Michigan restaurants are so STERILE. No atmosphere.
As to your MD8 head-cleaners; I've been using my MD8 for three years and have never had to clean the heads. So, that may give you an answer. I'm not sure if that is recommended; you can check with Yamaha on their site.
I'm now trying to learn my Yam 2816 high tech box. It's nice but it will be a while before I get fluent. The MD8 was kind of like, out of the box, and record. But, not true with the 2816.
Enjoy those great restaurants in Chicago, Dave.
Green Hornet