Look for unique value in col A & col C then find most recent date in col B. Delete rest

Hello VBA experts,
I have a macro that looks for the unique value in col A and then looks at the most recent date in col B, then it deletes the rest. I am needing the macro to look for the unique value in col A & C and look for the most recent date in col B. Delete the rest. Would someone be so kind and look at my macro and help me add the second unique value to the macro? Please and thank you so very much. Thanks!!!!