Works wonders for me, defintely have more symptoms when the cats
are due to be washed. Vaccuum a lot and groom the
cat regularly outside to help keep the hair down in the house.
I would double check first that there is a true allergy involved, no use going through everything if you aren't allergic and it's from something else. Also look at the cat litter you are using, some have strong perfume or a lot of silica dust which is known to affect some people.