Check into soda blasting. We have used it to remove striping and emulsion oil from concrete.

Not as aggressive a using sand for your abrasive.

Just like it sounds it's a soda of some sort. Can actually taste it, tastes like baking soda.

No pics as I have gotten out of that line of work.

Last edited by 10gaugemag; 02/08/23.
The last time that bear ate a lawyer he had the runs for 33 days!