Are those spots etched to your windshield already? As far as I know, only etched spots will come back very quickly, when immediately after wash it may look clean but in actual fact its still there.

Try take a damp cloth and wipe over the screen, do u see the spots or is the water on the screen flat?

When u use your wiper water mist and wiper to wipe, do they go away?

When I used it recently, it didnt happen to me, my towels were fine after machine wash and dry.

What did u do with the towels after apply and buff off?

Erm, think gloss enhancing usually means wax, especially carnauba based wax. Is that what u are looking for?

Erm, that looks destroyed. It cant clump back together and bits keep falling off, yes?

Mmm, cleaner waxes are less on wax and more on cleaner function if not mistaken. At least spray wax is purely wax (even though watery and sprayable). Better to keep cleaner wax only for cleaning stubborn dirt stains that regular wash cant remove.

Hmm, perhaps try this, go Daiso and get a lint roller (a roller that has a a roll of sticky paper), roll it over the entire cloth 1-2 rounds from corner to corner covering the entire cloth, tearing off the paper when it comes non-sticky anymore. Do on both sides of the cloth.

Usually that's what I do to maintain my microfiber towels, just not sure if it will help in your case.

If that doesnt bring back the absorption ability, then unfortunately your cloth is having the same issue as a typical buff-off cloth used for coating, which is the coating harden on the cloth, and usually its thrown away. However, I wish to state that this shouldnt be the case, as coating's concentration of the "coat" itself is far more concentrated than HCS. I could be wrong.

Erm, as far as I got the instructions from Osren is dry application is only for the neat (undiluted) version of the HCS. That is considered the based coat. Subsequent coats that u wanna apply dry also should be undiluted, else if want to use as topper 1:4 then should be applied post wash while car is still wet. When I use it undiluted, I also spray on my towel instead of the panel to ensure even application.

However, I dont know why ur method should make the towels unable to further absorb water anyways.

By cleaning sunroof u mean removing the water spots from the glass on the sunroof?

Hmm, not sure if detailers would provide that kind of service. Cleaning part I think detailing shops can handle, but lubricating maybe not as generally not in detailing shop arsenal. Perhaps u could ask ur service center to clean? Just my 2 sen suggestion.

How long since application? How many times rain since? How many car washes since?

Generally the longer it is, the beading reduces.

Perhaps consider topping up after the next 1-2 washes.

Try claying. Chemically, water spots can be broken down with acid, but got risk of harming paint if used imporperly.

Personally, yes, I would say the touchup pain helps. My wife black Toyota also had many of these stone chips, chips at the edges of the doors from hitting walls when open, etc. I did touchup paint and most of it are far less visible now.

Just know u need a very very fine brush (ideally go some art or stationary shop to get one) to be able to touchup just at the chipped spots.

Previously when I used clay towels, I stored a bunch of them immersed fully in water in a container (those plastic biscuit containers that u get during festive seasons). Please do wash and rinse thoroughly first before submerging them for storage, and keep it in cool place away from sunlight.

Well, like it or not the paint that chips off would probably chip both clear coat and color coat layer at minimum, and those layers are quite thick in comparison to what u apply. Touching up the paint can blend the paint color fairly well, but the chip in part may still be somewhat visible when u are looking for the spot. U could try topping it further with the clearcoat touchup, then it could be slightly more level with existing paint and less noticeable at a glance.

Personally to me I find it more than enough for small spot touchups. I havent gone to the point of attempting to wetsand and repolish the touchup spot in attempt to make it fully blend in, though I have seen some videos on youtube to show that it is totally possible to completely blend touchup paint to existing paint.

It may not be the best, but definitely the most bang for your buck until u decide to do a complete respray or change car. Just my 2 sen.

Perhaps try to give your car a round of claying or polishing, or send the car for a good polish and see how it goes from there. Knowing many folks from our parents generation would only do very basic car care at the best of times, there could be much contaminants embedded on the paint surface causing this issue.

Spray waxes should give u some basic protection against the weather elements for now. Perhaps worth to buy one and try.

Perhaps u can try testing application on a naked panel vs Fusso Coated panel. I have read some spray sealants or waxes could streak even on their own, but it may be due to incorrect application process. Ur situation adds another factor to the mix that needs to be retested.

Did u also follow instructions from the bottle itself? Or perhaps check on youtube to see if anyone has similar issues?

Generally any application of protection, whether spray sealants, waxes or liquid/paste waxes, the best method is always to apply it as thinly as possible. Thick applications will cause the protection to harden thick, thus giving the streaking effect. This is from my experience.

Considering u washed 4 times since last application and weather condition in the last few weeks, I would say it still looks fantastic!

Welcome to the DIY enthusiast group! Yes, it is a steep learning curve when learning to DIY, but that is made much easier now with internet and youtube.

From a technical standpoint (as how I understand it), water beading shows the surface of your car paint have high water repellent tension, thus instead of the water being flat all over your car, it beads up and rolls off easier from your car while driving. Unfortunately as water beads evaporate, due to its concentration (which also translates to concentration of minerals in the water on each bead), as the water dries off the minerals are left there and grabs onto your coating or paint surface.

Anyone has a different understanding, please share.

Are u living in Klang Valley area? Best way to start from basics is to visit a detailing supplies shop like Osren. They will be able to get u setup very quickly.

Start with some washing and drying equipment. Then move on to some basic protection like sealants or waxes.