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Try using a steam iron, put a damp cloth on top of the paint and then the iron on top and steam the paint, it may soften it enough to get it off with a plastic scraper so you don't mar the floor finish.
Check for a clogged condensate drain line (a/c heat exchanger) which would cause it to overflow onto the floor. It could also be a windshield or sunroof leak. I've had this very same problem from the top of the windshield leaking. There was a very small gap between the windshield and the edge of the roof, Where it's mounted. I had to use a pressurized garden hose to find the leak.
if it is slippery and stinky, your heater core is leaking. otherwise you have a leak around your windshield and rainwater is coming in and not drying out as it is under the mat. very hard to track down, get some clear aquarium sealer and get to work.
when i initially asked the question i didn't see the part about the damp floor. sounds like the heater core is indeed leaking. someone may suggest using stopleak or something along that lines. i wouldn't recommend it as it will block passages in the motor where you need water to flow for proper cooling. basically you need to have the heater core replaced. if the vehicle is old and dying stopleak may be a cheaper alternative tho.