General perception for using plastic scrapers is for removing hardened or soft sealant, caulking, stickers, decals, paint, other things needing scraping.
Ultimately the end user makes the choice in which plastic/resin scraper works for their task.
Scraper plastic types included:
Our softest resin, more chemically resistant, Boeing requires for use on alclad surfaces. Boeing Approved Material
(This material requires more work at scraping due to softness, it is the best option when wanting to avoid scratching surfaces)