One thing I have to continually deal with when building and repairing things is removing sticky tape glue. People have wrapped things in tape, parts have come with barcodes stuck to them, etc. I've tried various things, and this is what actually works for me, I'm not just someone spreading someone else's untested ideas (as seems to be the case with most internet advice I see).
I've found the best way to remove sticky residue from plastic or metal surfaces was with olive oil. Smear a tiny bit on, and start wiping off the goo. And just repeat a few times. Then, if you want to remove any olive oil slipperiness that didn't wipe off, use ordinary diluted dish‑washing liquid. And, generally speaking, neither of them are a problem with getting them on your skin, nor difficult to clean off when you're finished, it's ordinary stuff that you deal with in the kitchen. But if you have sensitive skin, then using kitchen gloves is the simple solution.
There are some chemical sprays that are meant to do the job, often using some orange‑oil‑smelling citrus ingredients. I only found them partially effective, they stink to high heaven, it's not great for your lungs to breath in their fumes (not to mention they can make you sick), and does horrible things to your skin. So using them (outdoors) is the last thing that I'll try. Gloving up is harder to do with these chemicals, they can go through the gloves.
And I'd found the various alcohol‑based cleaners to be quite useless at this job, often damaging the surface of what you're trying to clean, and can be harmful to you, too. Pure ethanol being the most effective and least harmful, but hard to acquire. Dilute would be fine, and probably safer, but most denatured ethanol has had poisons added that cause various problems. The old methylated spirits used to be reasonably effective, but also harmful, and newer formulations being much worse. Isopropyl being harmful to you and what you put it on. Getting such chemicals on your skin does damage, and breathing in the fumes is bad, too.
I've never found a good solution for removing the crusty mess from old masking tape, though. The olive oil treatment is somewhat effective, and may require a lot of repeated effort. But its glue has often etched its way into the thing, rather than just being a mess on top of it.
Don't put masking tape on anything unless you're using it for its original purpose (painting things), and it's only meant to be a temporary thing. If you must use tape to hold things together, or so you can write a label on something, use another kind of tape. White electrical insulation tape and a texta is my go‑to solution. Or I print onto paper, cut it out, and put clear tape over it (I don't have a label‑maker, my need for this kind of thing is too rare to justify the cost).