ScrapeRite Plastic Razor Blades: 

The safest way to lift and remove vinyl.  This has been a life-saving tool for us when we needed to left an edge to reposition, or remove a foreign object from under the vinyl. 

Also great for removing stubborn residue.  Yes, it can still scratch paint.  Don't use too much pressure when using.  This is just much safer than lifting with a blade or scraping with a metal razor.  Sold as (1) $1.00 or (3) $2.00