Alienware M17XR4, what to use for cleaning??

Hi.

I bought my self this very old laptop, which I almost fell in love with as soon as I saw it.

Yeah it is 14 years old but wth...

It came in bad condition, so I want to know since the chasis is probably made out of plastic (has some rubberized feeling to it), is there a way to clean this thing out, specially on screen cover, and what to use for cleaning.

I tried isopropyl and some special liquid for cleaning ordinary plastic, no luck!