1. Micro Set (blue label) says on the label that it will soften decals and allow them to be removed - has not worked for me but then I have only removed decals from a very few models
2. Micro Sol (red label) - even when using to soften and cause decals to more firmly attach, this stuff can attack the paint if overused. In other words, it also will soften the paint (as well as the decal), and then unless you are careful, you can accidentally damage the paint . I do not recommend using this to remove decals - just use it to reattach a decal which seems to be coming off.
3. I have also tried various other products like finger nail polish, both with and w/o acetone - did not work. I have even tried lacquer thinner - did not work. And take great care when using this stuff, as it will attack most paints used on models if too much is used. These products do work well for removing glue, or for removing a part glued to the model (like an antenna, etc.) Again, use great care, limit the amount used, and test first on a hidden part to determine if the paint will be harmed.
4. I have also just scraped off decals with my finger nail. This only works sometimes, depending upon the model and the decal. Some decals are rather brittle, and not well stuck to the model paint. Be aware that you can damage the paint, if you scrape too hard. Also, on some old models, like an old Joueff or Eagle Race model the decals are almost like a tampo. I have removed decals from some Joueff models with my fingernail w/o problem, yet on other Joueff models this damaged the paint because the decals were so 'tough'.
6. Clear packaging tape works well. This is nothing like the frosted or clear 'Scotch' tape used to tape paper. This is the heavy duty stuff used to package boxes for shipping. The stuff I have is the cheapest from Shop-Ko. Just burnish it very firmly onto the decal, and then 'rip' it off. The first time I was not willing to just do that. So I carefully stuck the tape to the decal, and gently pulled the tape off. A little of the decal came off. I was afraid that the paint would be damaged. SO I repeated the process, pressing the clear tape to the decal harder each time, and pulling harder each time. Once I was convinced that the body paint would not be damaged, I just burnished the tape as firmly as possible with my fingernail, then pulled the tape back against itself as quickly and as hard as possible. After a couple of pulls the decals were removed. Some decal glue remained. I had to use finger nail polish remover with acetone to remove the decal glue. This was on an old Joueff P4 Ferrari. The paint was undamaged.
I hope that the above helps you, and the main point is that you should proceed with caution to avoid damaging your model.