I usually wash first so I can do door jams with soapy brush and rinse. That way any overspray with hose doesn't mess up interior I just detailed
Prep
Wash,engine,wheels,tires,wheel wheels,door jams,bumpers, rocker panels
switch buckets
Wash body top to bottom,rinse and Dry
Interior Detail
headliner,vac,clean carpets and upholstery,do all inter moldings top to bottom
Exterior Detail
Clay bar,wetsand scratches, compound,buff,polish as needed to restore factory shine,wax
while wax is drying dress engine and tires,paint or coat wheel wheels
remove wax
windows inside and out
final vac
roll outside to inspect
Inspect what you expect and you'll always have profection!