Driver HP, HP 2210PSC,

You can follow these steps to resolve the issue.
How to clean without removing the bulb:

Take off the hood.

At the back side, on top behind the window, are two round holes. With a small screwdriver you can take out the two screws.
Lift the back side of the window and at the same time click the front loose (first left then right).

The window can fully be taken off by disconnecting the wire (there is a plug at the rear side of the window on the right side).

On top of the bulb and mirrors there is a black cap, you can remove it by putting a small screwdriver in the two square holes
(one at a time) and pull the screwdriver to the right, the cap clicks off.

Now you can see the mirrors and the back side of the bulb (at the back side there is a wire). Clean the mirrors and the front side of the bulb using a wet cloth (with your small finger you can clean the front side of the bulb, that looks down).
You don't need to remove the bulb!