You did not know you needed a plastic razor blade. Until you found plastic razor blades. Very useful, great quality pick them up when getting supplies.

I love these plastic blades as apposed to the metal ones. less chance of scratching something. work great on windshields and windows for removing stuck on debris

Would have given it 5 stars but the blade part doesn't go deep enough into the seam to get the dried up wax, glaze or whatever else you put on your vechicle that get's caught in the seems.
The slanted part of the blade prevents it from getting deep into the seems to do what it was suppose to do. If they just made the blade without the slanted part this would be an excellent invention not to say that it isn't already a good invention.

I have used many plastic razor blades over the years detailing. These are by far the best. Double sided, thin, inexpensive.

A nice scraper that won't damage interiors.