By using correct techniques, method and products regularly
For protecting car against uv damage and acidic damages always use a car sealant/wax i.e 3d hd poxy
Always wash your car with 2 bucket method, clean microfiber cloths and use a dedicated car shampoo which has a safety data sheet and is ph neutral i.e koch chemie GSF to reduce swirl marks and micro marring and not affecting the wax life
While drying always use a quick detailer i.e koch chemie quick shine to avoid damaging paint while drying, increase hydrophobic effects, increase gloss and aid previously applied glaze. It is recommended to use a twisted loop microfiber drying towel for effective and effortless drying
After every 6-7 months use an iron remover i.e koch chemie RRR on body to remove fallout followed by claybar to remove any tar of upper surface sticked contamination.
To increase gloss polish car with a medium cut polish i.e 3d one and a polishing pad i.e maxima polishing pad every 6-7 months or whenever you think car has decreased it's gloss levels.
Do not dry dust, get it washed by service station or use substandard products