HM maybe I didn't show enough details. Some wise person said to use tape to keep things (like screws) you take off together. I say don't take off much - clean it and put it back together ASAP. Then go do another section - put it all back, go do another section - keep it simple. We cleaned with non pumas goop - we were in the house at her good antique walnut table. Mom said there were things we took apart that she had never taken apart - Folks this machine has been run HARD since 1948 and it is still ticking - well, it could use a bobbin winder... BIL could stand to paint it... nah - I like the merit badges.