I would imagine the owner placed the masking tape on the finish to prevent Refinish Restorer from removing the polish/wax? As apparently it will do that for plastic (if you accidentally got polish on your cladding).

Here's the labeling on the bottle:

-Freshens the colour of faded and mat plastic surfaces
-Protects against weathering
-Silicone Free
-Protects plastic and metal surfaces
-Easily removes traces of polish

Refinish Restorer is a liquid sealer for plastic and metal surfaces exposed to weathering. It penetrates deeply into the surface, driving out the ingrained dirt, restoring the original colour and provides a long lasting finish. Refinish Restorer is also very effective at removing traces of polish on e.g. plastic fenders and trims.
Now going thru thread 1, there's a number of msgs where one of the owners applied it during the day and it had rained on the vehicle all evening. Only to come outside the next day and see NO streaking, no dissipation. The photo is pretty cool.