I would have thought a Pro applied coating would have lasted longer than one year - and actually IIRC is about 11 months so far, again this is a garaged car. Xpel on the hood, front bumpers, lights, mirrors, A-pillars and first 10" or so of the roof. But it just could be that I did not use a strong enough wash to get rid of some of the older dirt and salt, even though I did manage - on a few occasions to shoot the car with water from the hose - no soap or Waterless wash.So, perhaps a proper decon wash will reveal that the Nanolex did hold up after all?
I think it would revive the coating.
What longevity did the installer claims?
As all lsp the miles is the most wear on them IMO. Then if garaged you get a longer longevity than a outside 24/7 car. But the claims in time is a little missleading IMO. A car that gets driven 6k or 12k or 20k miles a year and is equaly maintained and garage stored. I think has the most difference in longevity of a ceramic coating. And the lower side panels gets the most wear and tear and degrade faster than other parts of the car. The road grime is also much more on this parts and next is the front and then the back of the car. A ceramic coating is very strong against chemicals so I`m not afraid of the use of them the right way to get as little as possible build up of the road grime and road film. In this winter when I had the possibility to wash the cars. I have started with a decon like wash every time. And have gyeon wet coat on them this year and will apply Polish Angel Master Sealant to my car in the spring. Which name is a sealant but based on sio2 and tio2. The longevity is up to a year only but want to see how it`s working in the climate environment I live in. Then next year I maybe get a coating that can hold up to a couple of years.
A wash can looks like this.
Foam a prewash like Angelwax Cleanliness and clean rinse from the bottom and up.
Apply a tar degreaser that is solvent based on the lower parts of the car and the back. Not over the sidewindows. Clean rinse from the bottom and up.
Then 2bm wash with carpro reset.
Dry rinse or if needed a application of wet coat. Have foamed Angelwax Enigma ceramic infused schampo on it one time also. Next wash will be a spray sealant with sio2 in it. To get it protected to spring.
I think even when coated I will play around with different toppers of sio2 in it. Have Polish Angel High Gloss at home to be used on the PA Master Sealant

Like to test out different kind of products
Hope a decon helps you out and think it`s worth a try to get it clean from as much of the bonded contaminants as possible.
Yes I use a tar remover as it also have the possibility to desolve other kind of dirts also. You have old motor oil and transmission fluid and antifreeze products that are laying on the roads. I think when the road salt is spread on the roads this desolves many of that things and gets on your car. If you drive alot on asfalts roads you get tiny spots like film with tar also. Maybe not so much on the concrete roads. But it`s much of different dirts the wheels kicks up. There for different chemicals to different kind of dirt.