Aluminium is not only environment-friendly and weather-resistant, it is also quite easy to look after.
Aluminium frames only require an occasional washing with clear water, a sponge, and a soft cloth. For glazed surfaces, use your usual cleaning product (clear water, special spray, etc.). Once a year you will clean the rails of your sliding doors and windows, and check the ventilators.
Check the gutters and rainwater pipes of your conservatory after showers or storms: branches and leaves may obstruct the drainage holes.