The chemicals in the no pest strips are water soluable, so if it's in a confined area they're safe, but all exhaust should be turned off and I'd reccomend having no plants in the room. Then after the strips are taken down you can use a spray bottle with water and any residue would be gone 100% with water contact. It also breaks down 100% in a couple months, so never use them in flowering ever because the Dichlorvos will not have time to break down and can be trapped inside the buds in parts the water can not reach. Hope this helps
Edit: Here's my sources for using it safely-
CDC link >
http://www.atsdr.cdc.gov/toxfaqs/tf.asp?id=596&tid=111
"The major effect of dichlorvos is on the nervous system. Studies on people who were exposed to dichlorvos by breathing air in the workplace containing low levels of dichlorvos have not shown any harmful effects. Animal studies have shown that breathing high levels can cause nervous system effects.
Ingesting large doses may cause nausea and vomiting, restlessness, sweating, and muscle tremors, while very large doses may cause coma, inability to breathe, and death. Animal studies have also shown effects on the nervous system when animals drank water or ate food containing dichlorvos.
It is not known whether dichlorvos can affect reproduction or cause birth defects in people.
Animal studies have not reported effects on reproduction or birth defects when animals were exposed to dichlorvos."
"
- It evaporates easily into the air, where it is broken down into less harmful chemicals.
- It will dissolve in water, where microorganisms can break it down.
- It takes about 24–36 hours for half of the chemical to be broken down in water.
- Dichlorvos does not appear to accumulate in plants, fish, or animals."