1998 Mercedes Benz SL500 removing dash

I believe you are speaking about removing the instrument cluster to clean the bezzle area around it. To accomplish this you will need to remove the instrument cluster. Here are a few diagrams to assist you. First you will need extractor hooks.

I'm unsure if you can get these from an autoparts store. I do know you can order them from your local MB dealer, the part number is on the bottom of the diagram.

Next carefully insert the hooks on the left and right lower corners of the instrument cluster, between the dash and the cluster.

Once in find the removal ribs that are on the back of the cluster. This is done by feel and may be difficult to find. You will need the hooks fully inserted and rotate the hook ends toward the cluster in order to grab the removal ribs.

Next pull the hooks out alternating left to right with pressure. To remove the cluster.

Make sure the steering wheel is fully extended out and down to allow for complete removal. You will now have access to the inner bezzle of the cluster so you may clean it.

The inside of the bezzle will be accessable. Once out the cluster will give you access to the back side of the bezzle. You should be able to clean the area with no obstructions.