Congratulations on your success. Hopefully she
will have referals for you as well.
Ditch the Back To Black, and get some Mr Clean Magic Erasers
intead. Less expensive, and will do a much better job of cleaning
the trim as oppossed to trying to hide stains.
Invest in some painter's tape or masking tape, and some old
newspaper. This will help keep polish and wax off the areas
you do not want it getting on.
Some good MF applicator pads (for wax) and some foam ones
(for sealants). You can get these at most major auto stores.
Get a pack of the general purpose terry towels and a pack
of shop towels (the shop towles I'm refering to are actually
blue heavy duty paper towels). You can get these at Home
Depot.
If you dont already have one, you might also want to get a soft
or semi stiff toothbrush. Better yet, get a used one from your
house (just make sure it will not brush any more teeth

)
Some large plastic garbage bags, preferably the see-through
kind. You can use these in place of seat covers or floor mats in
case the seats or mats are still damp and the car has to go out
right away. It my look cheesy, but you can always cut the bags
to shape, and most of the time the folks will appreciate that little
extra effort (no one wants to sit on damp seats or have their
feet sliding around on damp carpet or floor mats).
You don't need more than one car shampoo, so let
the situation dictate what you will need. Personally,
I prefer to use QEW if I have to do some additional
work like polishing and such, or, if I do not have ready
access to a garden hose. I would use the Zymol (or any
other car shampoo) if the car is real dirty, I have a little
more time on my hands, and have a hose available.
And be sure to charge what you work is worth, in case she
does happen to refer you other folks. Let her know that the
price you charge her is between you and her. Then go make
out an hourly work rate sheet. Once you have an idea how
long a certain task will take, you can charge everyone else
accordingly. Once you do that,I think you may find that
the lady is indeed getting a bargain.