If it is a sweep you will be able tell by looking at it. Look up slide seals or sweeps on ebay or amazon to see what they look like. I have not seen any other types of seal though there are no doubt some.
If it is a sweep you pretty much pull on it while working with a thin paint scraper to get under it and remove it. Then you will try a variety of things to get all of the bits that are stuck in off. Most are stuck on with a double side tape with a pull off backing. You will carefully apply it and then use a roller to be sure it is fully stuck down. Hope that helps.
33' 2008 National Tropical on a Freightliner chassis.RVM#189