Stain on concrete

Jan 9, 2018
69
24
8
Central Arkansas
Real Name
Cody Davidson
#1

Customer had OLD paint (probably oil based based on how long it took!) on her driveway... 4000psi removed the paint - customer is thrilled... but there’s a stain where it used to be. Concrete being what it is I don’t expect it to completely disappear; any ideas what could lighten it for future reference?