Over the last few months I have noticed when parked on a slope with the front of my car facing downwards, there is a small puddle which flows down the slope. The leak seems to be coming in a gap between two of the underside trays under the front bonnet area near the driver side front wheel (US cars). I have dabbed the liquid in a tissue and it is colourless and has no smell at all, I am a bit confused as to what it is. I washed the car 5 days ago and it hasn't rained since, so I wouldn't say it is stored water in one of the trays. It has happened several times which is worrying.

it's condensed water from the A/C

And I was worried it might be something major! Where did you find that out from? I need to increase my technical know how on Porsches.

All cars with A/C have a water drain. Sometimes they plug-up and water drips inside the car, or a musty odor develops.

Don't be too hard on yourself for not knowing this--to have a great deal of car knowlege is the sign of a misspent youth....

Or, it could be an overly full windshield washer resorvoir. Mine was filled to the btim and when I parked the car on a slope facing upward the fluid would leak out of the container and run down the driver's side door sill and drip to the ground right in front of the rear wheel.