Kathe Kitchens wrote:
Another thing you can do inside your house is spray with a d-limonene & water solution. It will kill any adult fleas and larva in the carpet. It works very well, is a natural air freshener and also will knock out some of the stains you might have in your carpet. The one I always use is Orange TKO as it has the oil removed.
If you do mist the carpet and if you have pets (which probably is the case if there are fleas in the house), I would remove the pets, especially cats, during the spraying and until the d-limonene dries. Onto the paw pads and into the mouths -- my experience with this wasn't good.
There are statements on the Web that the linalool in citrus oil (and in things like lavender) will kill flea eggs, but that d-limonene will not. I have yet to see a clinical reference, so I regard that statement as merely anecdotal and maybe poppycock. I have a hard time believing that d-limonene will not kill flea eggs effectively, but I don't think a lot is widely known about the physical characteristics of flea eggs and their susceptibility to chemical attack. I suppose that, if the statement is true, a pure d-limonene product is not the best choice for flea control. I also don't know if I care for usinig a full-constituent "oily" citrus oil. One compromise might be to add some lavender to the d-limonene, if the linalool/d-limonene story really is true.
As for the carpets, "mist" is the operative word on d-limonene applications. I know from theory and experience that a d-limonene (depending on the solution strength) drench will/can dissolve some, many, or all of the adhesives that attach the carpet to the backing. That can ruin the physical structure and release who-knows-what adhesive breakdown products. Now, if all the carpets would just dissolve completely, we might have something...
Another possibility that is commonly mentioned is to mist a mild boric acid solution onto the carpets. I think that requires a delicate touch if there are pets and/or infants in the house, and I think I prefer the citrus as a probably less toxic and more instantly effective method. Probably the borate crystals would be better than spraying a boric acid solution, but that's another story.