Cleanroom is NOT CLEAN.
When i first visited China factory (fab, testing,PCB, SMT, and Cell Phone Assembly) as supplier quality engineer in 2006, a lot of things surprises me.
1. Dirty Cleanroom Cloth
2. A lot of Opeartors and Engineers in a tiny fab
3. A lot of high-level managers - don't come to fab
4. Gas Cabinet are corrosive
5. No or few gas detector in the fab
6. Don't understand SiH4 for.
7. Liquid on the floor of cleanroom