Please note the following for the cleaning and maintenance of the seat covers :

Before getting into the vehicle, close all Velcro fasteners that could touch the cloth seat covers and fabric trims. Open Velcro fasteners can cause damage to cloth seat covers and fabric trims.

Avoid the direct contact of sharp-edged items and accessories to the upholstery and fabric trims in order to prevent damage. Accessories include zips, studs, rhinestones on clothing or belts.

Dust and grit in upholstery pores, folds and seams should be removed regularly so that no permanent damage is caused to the surface of the seats by scratching.

Always check whether garments are colourfast to prevent damage to the upholstery. This is especially important for light-coloured upholstery.

NOTICE
Volkswagen recommends that stained upholstery is cleaned by a specialist company.
Seat covers
Cleaning cloth seat covers, fabric trim and Alcantara® upholsteryDiagonal Washouts
Diagonal wear spots on tires
Diagonal wear spots run at an angle of approximately 45°
with respect to the plane of circumference.
They usually occur once, but may also occur several times
along the tire circumference.
...
4-Pin Heated Oxygen Sensor (HO2S), Removing and Installing
Note
Do not repair the heated oxygen sensor wires. Repairing may
result in malfunctions.
Use the faulty sensor as a guide for installing all of the
accompanying attachments, cable ties or marking bands.
...
Cleaning leatherette upholstery
First read and observe the introductory information
and safety warningsPlease observe the following notes prior to cleaning the
leatherette upholstery .
Only use water and neutral detergents to clean the leatherette upholstery.
NOTICE
Do not use solvents, wax polish, shoe cream, spot remover ...