i have never tried acidic to do it nor had it done to anything ive ever owned..but i have seen people come into Lowes(where i work) and purchase the materials to do this... if you do it yourself it will run anywhere from 50-100$ ... depending on what type of stuff you use and so forth... they have kits made for staining/painting cement ... from garages to basements.. go to your local home improvement store and go to the paint department and ask them about it ...they will be able to further assist you in this.. but as far as $$$ it shouldnt be to bad and the work should be easy if the cement doesnt have much stuff on it.. like glue from previous carpet.

hope that helps scottsdale flooring

Coke has a pH of 4 whereby lemon juice has pH of 2.3.

The acid level for lemon juice is higher. Though I would want to recommend the best solution which is Hydrochloric Acid but it's corrosive. Yu may want to take hazard precaution.

Regards, Joey