Topic: rust removal

[dirtlessdave]

i've done this plenty but never a job like this.  I have a customer and there is 720 sq ft of drive and walk to do and it is covered with rust.  my problem is i'm stumped and don't really know how much extra to charge for a drive and walk with full rust removal    please all help is appreciated thanks

dirtless dave

[dirtlessdave]

or what about using oxalic acid what would be the best application or process of what to and i usually charge ,12 for concrete and how should i go about pricing this as well