Units in conservatory roofs should outlast the 1’s which sit vertically like in the doors etc.
reason being is that when there laying down they should never be submersed in water as there constantly draining. unless someone’s blocked the drainage with tons of silicone like a lot of people do…
The vertical glass like in doors and windows tend to break down when the drainage holes in the frames block and water sits underneath them. another usual cause of failure is fitters not using packers in the frames when glass is fitted.
No one ever gets units stripped and re made i have had to strip a unit once in my entire double glazing career and it takes longer than making a whole new unit. Generally the only they get stripped is when someone wants to keep a unique feature like special made led or stained units that they had made.
Get the units replaced and ask the person who is doing it to remove all obstructions from drainage holes and drainage recesses and it will then not only last a long time but new glass always makes conservatory’s look newer. get the fitter to clean the old plastic with solvent and it will look smart again. security tapes not a issue easy to remove and replace.