Miriam try spray and wash and let it soak for awhile on the tape residue. Sometimes tape that has been on a surface for a long time the glue will melt into the shellac and can be hard to remove. I have good luck with spray and wash with tape glue. If in the paint then you will have to use alcohol and Q-tip only on the mess. Once removed you may want to shellac the area. What we are trying to do is remove the contaminated shellac.