DONOT USE ANY HARSH DETERGENT on your top.
Your top should be a Happich or Sonnenland material top. It is a fabric not a vinyl top thatis use in the US. My 63 Chevy Impala had the vinyl top and I did use comet on it at times to really clean it.
Would you use Comet to clean your suit pants? No. treat the top like a fine piece of fabric. Follow Mercedes instructions and You can buy Mercedes Products to maintain it. Or buy quality cleaners designed and approved by Mercedes, Happich or Sonnenland.
Here is a copy of a Euro sites care instructions
How to keep your convertible hood in top condition.
When you've Top Cabrio install your brand new hood we will offer you some advice to keep your hood in top condition. Good care for your hood will guarantee a perfect condition and a longer life.
Right after your new hood has been installed you should keep the roof closed for at least 24 hours. The new hood will be able to adapt to your car's shape.
At first the roof will open and close not as easy as you would like, this is normal. After some time the hood has adjust itself to the frame of your convertible and will open and close easily.
Don't forget to close the roof when you don't drive the car. It's better for the hood to keep it's closed position and you will not be surprised by a swimming pool in your car whenever it starts to rain.
When your hood has become wet the best thing to do is to drive with the roof closed for a short while before opening it. This allows the hood to dry. When you want to go for a open ride immediately you should dry the hood yourself.
Hard brushes can damage the hood, therefore it's not advisable to take your car to an automatic carwash. It is much better to use warm water and a soft cleaning soap. Use soft brushes to clean your hood. Take your time to make it really clean and tidy. Rinse the hood with enough water to remove all soap. Do not use a high pressure cleaner! After cleaning the hood thoroughly dry it and go for a little ride to show your shiny hood to everyone and allow it to dry.
NEVER USE SOLVENTS, DEGREASERS OR ABRASIVE AGENTS.
When your rear window is made of plastic you should take special care in cleaning it regularly. Prevent sand and dirt from scratching all plastic parts. Again use a soft detergent.
After many years the rear window can become scratched and more difficult to see trough. We sell the right polish to remove these scratches and give you a clear view.
Assure yourself when opening the roof that the window is stored away unfolded. A folded rear window can easily burst especially when it's cold outside.
When you've let Top Cabrio install a new fabric hood you should treat the hood with special Happich spray. This will create a water and dust resisting coating which results in a longer life. Above all it provides you a more beautiful hood with its original intense colour.
This spray prevents the top layer of your hood to get wet, so it will dry quicker. Besides this dirt won't stick to your hood.
Top Cabrio sells this Happich spray.
When you take care of the above advices you will enjoy your hood for a long time. The colour will keep its original shine and the hood will stay in perfect condition.
Keep in mind that every time you open and close the roof this will cause natural creases to your hood especially near the pivot points. Never open the hood when it is wet!!
Hood is of course a Top in England.
Go here for additional info
http://www.worlduph.com
Dave