How can I take off my non-OEM tint?

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2007 CX-9 Grand Touring & 2015 Mazda3 5-door Grand TouringS
The two-layer tint is finally crinkling off my windows. What's the best way to take them off myself? Is there a way to take off just the clear layer and leave the colored layer? I'll post pictures once I figure how to do it. ;)
 
See how much a shop charges to take them off. It usually isn't much money compared to breaking the de-fogger lines on the rear glass and having to fix that.
 
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