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car washing
There is a DIY car wash in Chaussee de Haecht:
http://fr.elephantbleu.com/centre/haeren
But it does not have interior cleaning facilities.
On the same road you have Kennedy II:
http://www.uhoda.com/fr/pages/wash/wash-bruxelles.cfm
This one has an automated system for the outside bit, and you clean the interior yourself.
For something a bit more up market, the car wash at Woluwe Shopping Centre provides a very good service and a good range of options.
For something even better, nothing beats Wash One:
http://www.wash-one.com/carte.php
They cleaned my car before I had to sell it, it looked so new I did not want to sell it any longer :)