Hello, guys! Thank you for your help :D

Actually I think that dryer sheets are not to deal with a smell, but to prevent the buildup of static electricity on the clothes.

The "dryer sheet" is a small piece of material (not quite paper, not quite fabric) that is put into drying machines. (They are removed and thrown away after one cycle.) They don't help "dry" the clothes but instead add a "softener" so that towels, for example, come out "softer" -- that is, fluffier. They are not generally necessary where the water is "soft" but in some areas where the local water is "hard" (that is, there are more minerals in the water), they are used more often.

Hey Maria! Dryer sheets are something that people put into the dryer when they are drying their clothes. When you take them out of the washing machine, they're wet, so we use a dryer to dry them. Sometimes, clothes smell funny when they come out of the dryer, so we use dryer sheets to make them smell better. You take one and put it into the dryer with your clothes, then throw it away afterwards. I can't really describe what they feel like, but they kind of feel like wax paper. I found a picture of some of them on Google. Hopefully you can see this: http://cdn.pioneer.pgsitecore.com/en-us/-/media/Downy/Images/DT/Article/HowtoUseDryerSheets/DryerSheets_Img1.jpg?h=440&la=en-US&w=600&v=1-201602011314

dryer sheet - a fabric softener sheet (source: Abbyy Lingvo 5)