On the bezel:
I use a good quality micro-fiber cloth. Rub only as hard as needed to do the job. If you have to rub very hard - don't!!! Dampen a corner of the cloth with distilled water and wring it out as dry as possible. Using the wet corner, rub gently to remove the smears. Then wipe with the dry part of the cloth to remove any residue.
On the screen:
Be EXTREMELY careful about rubbing harder than absolutely needed. Pioneer warns against using *any* liquid on the screen. That said, if you are EXTREMELY careful and only use distilled water, on the micro-fiber cloth (wrung out very well first)... you can spot clean marks - that otherwise can't be removed with just the dry cloth.Do this at your own risk and be VERY careful not to rub harder than you absolutely need.
I've cleaned my 141's bezel and screen this way several times with no problems... YMMV
On an ongoing basis, I use a swiffer-like product to keep dust/dirt from building up on the bezel/screen, so I don't have to clean with the cloth and/or distilled water. As with cleaning, just barly touch the surface and rotate the swiffer often, so you always have a clean part of the swiffer brushing the surface.