Like @rowenaz said, there is no ‘waxing’ of ingrown hair. For hair to be successfully waxed (peeled) off it needs to be sticking out of the surface of the skin a fair amount for the wax to hold it. Ingrown hairs, as their name suggests, are not above the surface of the skin.
What I suggest is scrubbing your legs lightly, with a rough wash cloth like suggested above to remove the dead surface layer of skin and it may help expose the hairs. I have a few on my legs now and then that are very stubborn and I gently tweezers them up and then off. I use an epilady mostly (unless in a real hurry) for the few times I bother to remove hair on my legs.
In the between times, I try to scrub my legs with a loofah or a salt scrub in the bath or shower to avoid ingrown hairs.