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Your authorized Porsche dealer will be pleased to advise you.
Do not resort to using Porsche polish until it becomes evident that the normal preservatives no longer produce the desired finish.
Spots and stains
Minor paint damage
However, if there are already traces of corrosion, they must first be removed carefully and thoroughly. Coat the area with a rust-proofing primer and finish off with a top coat. The paint code and color number are found on the data bank in the Maintenance booklet.
The engine compartment and the surface of the engine are treated with a corrosion-inhibitor at the factory.
If degreasing solvents are used to clean the engine compartment or the engine is washed down, the process almost invariably removes the corrosion-inhibiting coating. It is then absolutely necessary to have a durable preservative applied to all surfaces, body seams, joints and assemblies in the engine compartment. This also applies when corrosion-inhibitor parts are replaced.
Risk of damage to the alternator.
Effective rust-proofing is particularly important during the cold weather season. If the vehicle is driven frequently in areas where salt has been spread on the roads, the engine compartment should be cleaned thoroughly and subsequently sealed after the cold weather season to prevent salt from causing any lasting damage.
The road dust which settles on the windshield and windows contains particles of tire rubber and oil residue. The interior trim and upholstery release particles, particularly in strong sunlight, which collect on the insides of the windows. These deposits are augmented by impurities in the air which enters the car through the fresh air vents.
Door windows feature a water-repellent (hydrophobic) coating which prevents soiling of the windows.
This coating is subject to natural wear and can be renewed.