Z-Man, Naphtha is my "go to" remover. I buy gallon cans at Wally World real cheap. If you can't get there or out to Lowes or Home Depot, go to the 7-11 and get a small bottle of Ronson lighter fluid, Same-Same just costs more.
3M makes a tape adhesive remover that will do the job, not harm paint and costs about 25X as much. Haven't smelt it lately, but IIRC, it sure smelt like naptha.
By the way, naphtha will remove ALPS printed decals........
Any work on the Yak-9 plans?
Bill