I find svc 189 buses well maintained more or less, unless wear
and tear (597C floorboards), this goes kudos for KJDEP as
well.
Therefore, favourite also can promote, because, simple, it is and
should be well maintained.
1224Y, 1162S and 633G are some of those well maintained. Sometimes
there would be dirt but soon, they are cleaned as they are back
from their split breaks (except for full shifts buses, can see
cleaner the next day). This applies to all the buses, but these
stand out. 869T has 'Take a look around our little communist town'
which i find funny. Its behind the joint, at the side of the seat
before the third exit. Same message found on 777A before.