Yes, if you used to get a bit of toast stuck under the keys of an old Thinkpad you just bash the key a couple of times and the crumb breaks up a little. Problem

Yes, if you used to get a bit of toast stuck under the keys of an old Thinkpad you just bash the key a couple of times and the crumb breaks up a little. Problem solved. Clear out any crumbs, dust and accumulated pet hair every now and then for neatness. Only '16 and on model Macbooks seem to require a cleanroom for the keyboard.