I was worried about that. Guh. Well, on the up side, if you can constantly keep 'small' doses of ratty goodness around you, you could possibly develop a tolerance for them. In the mean time, do what you do so well...keep a clean house. Oh, and take the good drugs.
Something you might want to try? Give them water baths in distilled water. An allergist suggested it to me with cats. The distilled water supposedly breaks down the enzymes in their fur from their saliva where they lick themselves. It may have less effect because rats are like cats on meth, so they may lick themselves too frequently for it to make a difference. Or it may be that the enzymes are different and it will not work on them at all. But at least look into it.
Here's an article on it: http://www.fcaaia.com/docs/protocol_cat_washing.pdf
Something you might want to try? Give them water baths in distilled water. An allergist suggested it to me with cats. The distilled water supposedly breaks down the enzymes in their fur from their saliva where they lick themselves. It may have less effect because rats are like cats on meth, so they may lick themselves too frequently for it to make a difference. Or it may be that the enzymes are different and it will not work on them at all. But at least look into it.
Here's an article on it: http://www.fcaaia.com/docs/protocol_cat_washing.pdf