its a hard top so no maintenance I'm aware of. Lubrication every 5-10 years is probably worth doing from a preventative perspective, I'd have a dealer do that to ensure the correct lubricants are used.
Rubbers will require replacement eventually (10yrs+) for best results but in the meantime just use a rubber feed such as gummi pflege or similar.
My rubbers at over 6 years old have some ingrained mould growth which I can't remove but are kept at bay by the feed. I intend to replace all rubbers and numerous other items on its 10th birthday to keep it as new.
