When brightening concrete with oxalic acid, what is a good ratio of oxalic acid powder to mix per gallon of water?
What ratio for using to remove rust?
Also, do you need to rinse it off? If so, how long should you let it sit prior to rinsing and finally, will it kill the grass?
What ratio for using to remove rust?
Also, do you need to rinse it off? If so, how long should you let it sit prior to rinsing and finally, will it kill the grass?