I've had a drain plug that has been dripping, for some time, on the concrete drive. The skim coat of the concrete is long gone so it is quite porous.
I have applied Gunk engine cleaner and pressure washed it and it is hardly diminished.
Any ideas on how to make it disappear?
I have applied Gunk engine cleaner and pressure washed it and it is hardly diminished.
Any ideas on how to make it disappear?