Washing really does miracles with drowning the persistent fleas, since once they find themselves cozy in your sheets and clothing pieces, there's no helping the biting nightmare.
The first thing you should do after noticing the first signs of the flea presence in your house and biting marks on your skin, is to gather and roll in a bundle, in case you don't plan or can't wash them immediately, all the potentially infested things as sheets, blankets, clothes, even plush toys, cushions and rugs lying on the floor. You should push them into the washing machine and press 60 degrees temperature (if possible), but you should make sure that the washing will go through at least one hot cycle. A useful tip would be to let your washed things dry for at least 30 minutes (in a dryer if possible). Fleas will most certainly fail to survive two hot cycles.
However, beware that sometimes, washing just the sheets and clothes won't eliminate the fleas in their entirety. Some of the fleas might have nested and lied eggs in your matress, so you might have to deal with it as well in order to complete the process of elimination.
Aside from Frontline which can come in a shape of a collar or liquidy substance that rub into your pet's skin and hair, flea sprays come in many shapes and sizes and are pretty much effective preventatives when it comes to flea infestation.
The thing you should look for in your flea sprays are "metophrene", "fenoxycarb", and "pyriproxyfen" insecticides for total extermination. But when dealing with these substances, pay attention to the toxicity information as stated on the "Entirely Pet's Blog":
Please note that toxicity information is included for your benefit, though products that utilize these ingredients do so in small amounts that are incapable of harming pets or humans when used appropriately. The vast majority (+95%) of users do not experience side effects associated with these ingredients and many that do experience them due to improper usage such as ingestion of a topical product or an inappropriately large dosage.
In case you have a cat, you can find in the same source:
Because cats should not ingest permethrin due to their inability to metabolize this synthetic parathroid, it is important not to use it in a household where cats may come in contact with it. This being said, permethrin is minimally harmful to humans and dogs unless an excessively large amount is applied or ingested.
Make sure to spray the tiniest corners of your house - from rugs and carpets, to hardly reachable corners and floor cracks. Larvae usually hide in the dark places, so pay special attention to these parts.After spraying the house, leave it together with your pet for a couple of hours. The process should be repeated every 2 weeks if the effectiveness is to be achieved!
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