Rust Remove

Rust removing process...

How dose this clean so well ??

What type chemical is that ??

Should I fire them ?
They just ran without finishing the job

Removing rust with expensive spray ??

Rusty Pendrive vs Polisher

Forke vs Polisher

Removing rust from this old spone

What cloth is that he polishing with ??

What chemical is that ??

What was that liquid ???