Start at the top
DIYers usually start by vacuuming the carpet. That just pushes dirt from the dash, seats and door panels back onto your freshly cleaned carpet. Professional detailers start at the top and work their way down to the carpet.
Suck it up as you go
Use a small detailer’s brush and shop vacuum to remove dust and dirt from all the nooks and crannies on your dash and console. Hold the shop vacuum wand near your brush to suck up all the crud as you work your way down to the floor.
Brush and vacuum your carpet
Automotive carpet doesn’t like to let go of dirt. If you just vacuum it, you’ll leave plenty behind. To remove more dirt, detailers use a stiff brush and scrub the carpet as they vacuum. You’ll see the dirt particles bounce to the surface so you can suck them up with your shop vacuum.