I removed the ac compressor and dryer today and flushed the high side with very little residue to speak of. the flush fluid was clear that I can see. I poured it through the hose (top side) and pushed it through using air compressor.

The AC compressor is totally empty, and the o-rings (6 black in color) appears to be in good shape.

I removed the panel below the steering wheel and visually, I found the exp valve to be dry and clean without any traces of any leak, so I thought I would leave it alone. I was planning on flushing the low side and just push it with air, perhaps mid psi ( not too high).