my daughter's science class did an interesting experiment a couple of
years ago...the long story short version was that just plain water
actually removes most stains better than any cleaner they tested, and
they tested 10 of them.  so...do you really need anything with chemicals
in it?  try water, you'll be shocked!!
 
also, on my opinion, you can never get the residue all out of the carpet
after you use a cleaner, and then it acts as a magnet for dirt, because
it's sticky, and round and round you go!!
 
i do add a little (teaspoon or so) of the orange scented cleaner to the
water, just to make everything smell nice, but that's it.
 
i have 2 ferrets with allergies, both different.  my marshall's guy is
allergic to something,(haven't figured out what to this day), that comes
out every fall, and he gets a rash, a sinus infection, and is generally
miserable for a few days.  we now just put him in the bathroom, (because
it's the smallest room), with the vaporizor for 2 or 3 days with vicks in
it.  this works for him.
 
my breeder ferret is my spring guy, and he swells up like a ballon, and
gets a rash that looks like hives.  it's really awful, and he can't
tolerate benadryl, so the itching is merciless for him.  we've tried all
the prescriptions and over the counter stuff, but basically what works
best for him is...bathroom again, we run an air purifier with a hepa
filter, we run a himidifier at full strength, and put heat on to about 70
degrees.  this results in a sauna type effect, but the extra moisture
really seems to cut down on his itching.
 
you have to just keep experimenting and asking, and eventually you'll hit
on what works best for him.  good luck to you both!
[Posted in FML issue 4681]