Not bad. I haven't actually use any of their polishes, but solutions such as degreaser, car shampoo, fabric cleaners are actually affordable compared to many brands and it works.

I am a fan of their aio paint cleaner 51, and have many of their detailing tools. What I like best is their dedication in servicing their customers.

I am experiencing the same problem as yours, my porch only covers half of my car.

and i have a black car, so watermarks are quite apparent on my car. You would want to try the mildest solution to start with, from claying -> acid based water removal -> polishing -> compounding
But I do weekly washes, and sometimes weekly waxing depending on my available free time.

For your case, try orsen's paint restorer, it is a paint cleanser that contains solvents that cleans and abrasives that somewhat cuts a little, might be able to remove those embedded dust and watermarks.
Else, polishing will always do the job. For more serious watermarks, ie: type 3 watermarks, you would need some compounding.

Liquid waxes that contain petroleum-based ingredients contains solvent that can actually "clean" a little on paint. Which is why i top up my wax very often. My gf's car is white, i find it very often that i have to re-wax on her front hood because of embedded dirt.

edit: just read that your car is coated, missed out on that. you can opt for coating-reactivator or straight to watermarks removal for that. don't recommend polishing it unless you know what you are doing. but you can still use any paint cleaners like orsen's paint restorer on it.

what is your car coated with?
I wouldn't be too worried la if i were you, as long as no polishing or compounding steps are taken.
Most coatings are able to withstand generic chemicals. waterspots removal like meguiars is quite safe. for coating reactivator, usually best to stick to reactivator that contains sio2/silica based products as most coatings are based on those.

Where is your outlet?

Haha. Btw, where is their outlet and their cost?

Can post picture for further advice.

checked their facebook, did not disclose the coating that they are using.
But again, almost all are silica based. so pretty safe to use waterspot removal