fear of germs

i don't know why but for some reason advertisements for cleaning products annoy me more than any other ad. on tv. especially the ones where it's a mother saying how she doesn't want her children exposed to germs that may be on the kitchen counter, the sofa cushions or, heaven forbid, in the toilet bowl so she likes to spray chemicals which claim to kill 99.9% germs on these things and let her family be exposed to those instead. i don't know why those ads bother me more than other ads which are also using fear of something to get people to buy a product but they do. why don't people realize, most germs aren't going to harm most people and that breathing in or ingesting chemicals from cleaning products is likely to have some negative reaction in a person's body (even if it does happen slowly over many years)?