Acrylic = Plastic.

That's not necessarily A Bad Thing<tm>, but it's a fact.  I have a Thetford
Galaxy and am happy with it.  I have yet to scratch the bowl, but I'm sure
doind so wouldn't be too difficult.  If your wife was truly "aggressive" in
cleaning your toilet, particularly if she used an abrasive cleaner, the finish
is probably permanently marred.

Probably not, depending on just HOW abrasive the cleanings were.

A seven-year old toilet?  Replace it with a good china model and your DW can
go to town cleaning it, probably even with a pumice stone!  Good luck!

Difficult stains can sometimes be removed using a liquid cleaner called
"CLR". "Soft Scrub" cleanser can be used without scratching or damaging the
finish.

Most any scratched plastic can be polished. it becomes a matter of how
much time and effort you want to spend. Without seeing or feeling the
depth and extent of the scratching it is difficult to comment but
generally you need to treat it like you would rubbing out paint-

A good place to start would be to try all three of these, in
descending order (3, then 2, then 1):
http://www.tapplastics.com/shop/product.php?pid=113&
If the #3 doesn't smooth out the surface scratches, start by using
something like 400 or 600 wet/dry and sand it as smooth as possible.
Follow with flour of pumice mixed with water (I have also used it with
WD-40 for polishing metal). Use plenty of water- there should be a
good source handy for that..  ;-)    

Your wife should be able to see herself after that!
 From Randy & Val
1990 30' Rexhal Airex

If your wife scratched the plastic with a cleanser and soft rag, it's
not hard to polish. Buy some hand rub buffing compound and use a T shirt
to buff the heck out of it. Plastic buffs pretty fast. If you decide to
get olympic and make a buffing tool, like a buffing wheel on a rod, with
an electric drill, keep it moist and buff slow. Certainly under 1500 RPM
so as not to put burn marks into the plastic with the compound. Finish
by hand.
If the plastic is scratched with an abrasive pad, you need to wet sand
down the the scratches with progressively finer "wet or dry" sandpaper.
Start with 400, then 600, maybe even 1000 grit. Then buff with buffing
compound. BTW, hand rub buffing compound is microscopically more course
than machine compound and can be used with a soft cotton cloth and will
work on damned near anything. Machine compound is a finer grit for auto
paint for use with a buffer and it is harder to burn paint with it.
Machine compound is for use with a buffer, always under 1500 rpm. I use
hand rub and a buffer, but if you don't know exactly what you are doing,
you will burn paint or smear plastic using hand rub with a buffer. Hand
rub and a slow buffer will make an Avion, Airstream, etc, look like a
mirror in a few hours. You can also buff out minor scratches on mirrors
and glass, or chrome. If you want glass to look really new, buff it out,
but remember to buff it slowly until the compound is gone, because there
is oil in the compound and it will leave streaks. Streaks can be buffed
out using products like Liquid Ebony or Maquire finishing products. You
can buff brass, silver, epoxy table tops, lacquered wood, tile, SS
sinks, tail lights, whatever. Sometimes I buff out my tools.