Micro Set is what you want. Micro Sol will just melt them more onto your model. I’ve had some luck gently removing decals with Set, but it takes time, patience, and luck. I keep the decal wet and very gently use a brush as a sort of chisel, slowly working the tips of the bristles under the decal. Work your way around the perimeter of the decal until you find a corner that starts to lift and go from there. Eventually, you can get the decal floated off of the model. This doesn’t always work; sometimes the decal is too brittle or stuck down too well.
Ben