Hiya,
we've got a petshop and so have to be quite consciencious about cleaning and disenfecting etc.
We clean all pens and cages every day with conficlean powder disenfectant, this kills VHD, Parvo virus (etc. etc. we dont do dogs, but it's the strongest there is), we clean and disenfect all the floors several times a day with dettol and use antibavterial hand wash between touching each / bowls / bottles / cages / pens and use the anti-bac. hand gel (tescos, sainsburys, named brand, whatever's there, we've got hundreds of bottles floating round so there's always some within easy reach. All bowls, food hoppers hard beds (kittens) and litter-trays are cleaned out and disenfected twice a day and water bottles are washed every other day (unless animals changing pens etc).
kittens are de-flead & wormed as they come into the shop and kept on stanby (not sold) before we've had them at least 7 days.
I'm not so strict with this on the bunnies because we breed them all ourselves. We do take them into the shop a week before they go on sale, but this isn't in quaranteen, but rather so that they're not getting moved too much too often and gives us a chance to keep a close eye on them to make sure they're fully independent and def. ready to go - none are sold before 8 weeks old. On the rare occassion we do buy rabbits, it's only ever from one other breeder who we've known for years and trust her rabbits like our own, but still hold them back a week before they're sold. After the trouble I had with the 1st 4 buns I got from P@H, I dont buy my own rabbits from other pet shops any more, just breeders and I tend to stick to the same 1 or 2 once i've found a good one. After the 1st one's been kept seperately for a week or 2, and i've seen thier set up and know i can trust it then they go into thier own hutch, which is cleaned & disenfected with a regular animal-friendly hutch/cage disenfectant, and these are in a home-built shed which has space betwen hutches and not totally enclosed so good ventilation. floors and cleaning equipment is cleaned every time it's used (floor disenfected about 2 times a week with boiling water and zoflora / dettol), pens are collapsable and never left up in the evenings, so constantly moved around, buns are treated every 6 months with panacur, in between with ivermectin, rear guard in the summer, vaccinated regularly and vet-checked every 6 weeks or so and we have an indoor "hospital" cage for poorly buns where they're isolated from all other buns. in the summer, all bunnies hutches are also sprayed down weekly with dynamite which is an insect repellant made up of citronella and various other strong smelling stuff which is fine to use even on animals and their food dishes, hutches, water bottles, etc, but mites, flies, bugs etc. hate it.
We're as vigilant as we possibly can be, but think that there's always more which can be done, you have to strike a balance i think otherwise you could spend every minute of every day trying sooo many different preventatives etc. and then it becomes clinical and you've turned your home into a lab and dont have time to enjoy your rabbits too..