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 stiffest resin, it is more chemically resistant and generally used for removing hardened sealant soaked in solvents.
(This material is abrasive. Do NOT use on alclad or unpainted surfaces as it can scratch.)