Tape removal from aluminum siding depends on the thickness of the tape remaining. Tape on aluminum siding requires a solvent like Goo Gone to take off the glue. Use caution with scrapers and single-edge razor blades because the finish on aluminum siding is soft and easily damaged. Try plastic putty knives, but do not get them too hot or they soften. Scotch tape removal from wall article. Scotch tape removal from wall
People put the double-sided tape on aluminum window frames from an outside plastic film weather proofing kit. When I took the plastic off for the summer, the tape stayed and I could not get it off without damaging the white aluminum finish. Now, all the blowing dirt has clung to it and it looks terrible.
The plan of attack will depend on the thickness of tape still adhering to your siding. Use a heat gun if there is a thick layer of tape on the siding. It will soften the adhesive and allow for easier removal. Careful not to get the siding too hot or you could strip the paint off the siding.
Once most of the tape is off, we like Goo Gone to soften and remove the remaining adhesive. First, test a safe area for compatibility before possibly damaging a visible area of the siding. Use a cotton rag to dampen a foot or more or the tape with the Goo Gone. Work small areas to melt the adhesive. Clean up each area before continuing.
Once clean of all the tape, wash the area with a mild soap and water. Krud Kutter makes a siding cleaner that works as well as anything we have used. This will help get rid of some of the smudges created with the adhesive and the Goo Gone.
Next year try the inside storm window kits. They work well if you do not add storms or replace your windows sooner. Let the weather beat on the exterior glass and leave the plastic in the house. The dead air space created by the plastic really does save heat. A permanent track is available that will hold the plastic year after year. It was used in my previous house with great success for several years.