What you need is:
- nail polish remover
- cotton pads - I suggest 1 per 2 fingers - 5 altogether (use more if you'd like, they're not that expensive)
- a small bowl with warm to hot water
- hair conditioner
The first thing you want to do is put a decent amount of hair conditioner into a bowl with warm water, or even hot, depends on what you can endure. Use an egg whisk and whisk those two together until the conditioner turns your water pasty and forms a nice foamy surface.
Soak hands in the solution for 10-20 minutes until your fingers go wrinkly and pruney. The conditioner will actually condition your hands and soften your nails and nail polish which will make it easier for you to take it off.
Now, the proper way to do this is NOT to wiggle the cotton pad from left to right because that way you're actually creating color residue but to just pull it straight downwards (from the cuticle to the tip).
THIS IS VERY IMPORTANT.
Also, do NOT use that same spot on the cotton pad to get off the rest of the color from that nail, rotate it, move it or fold it to find a clean spot and repeat the step. Your cotton pad will look like mine does in the left photo. That should be a rule with red and blue nail polishes: NEVER REUSE THE STAINED SPOT ON THE COTTON PAD. I'll rather use 5 whole cotton pads for my 10 fingers than one and get left with wounded looking hands. And when you're done you will have tint free but still pruney fingers like I do on the right photo and you're ready for your next nail polish! :)